Resources tagged with: Ratio and proportion

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There are 72 results

Broad Topics > Fractions, Decimals, Percentages, Ratio and Proportion > Ratio and proportion

Roasting Old Chestnuts 3

Age 11 to 16

Mainly for teachers. More mathematics of yesteryear.

Cereal Mix

Age 11 to 14
Challenge Level

A farmer is supplying a mix of seeds, nuts and dried apricots to a manufacturer of crunchy cereal bars. What combination of ingredients costing £5 per kg could he supply?

Ratio or Proportion?

Age 7 to 14

An article for teachers which discusses the differences between ratio and proportion, and invites readers to contribute their own thoughts.

Washing Elephants

Age 11 to 14 Short
Challenge Level

How long will it take Mary and Nigel to wash an elephant if they work together?

Burning Down

Age 14 to 16
Challenge Level

One night two candles were lit. Can you work out how long each candle was originally?

Rule of Three

Age 11 to 14
Challenge Level

If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?

Bus Stop

Age 14 to 16
Challenge Level

Two buses leave at the same time from two towns Shipton and Veston on the same long road, travelling towards each other. At each mile along the road are milestones. The buses' speeds are constant. . . .

Do Unto Caesar

Age 11 to 14
Challenge Level

At the beginning of the night three poker players; Alan, Bernie and Craig had money in the ratios 7 : 6 : 5. At the end of the night the ratio was 6 : 5 : 4. One of them won $1 200. What were the. . . .

Tray Bake

Age 11 to 14
Challenge Level

My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

Racing Odds

Age 11 to 14
Challenge Level

In a race the odds are: 2 to 1 against the rhinoceros winning and 3 to 2 against the hippopotamus winning. What are the odds against the elephant winning if the race is fair?

Fractions Rectangle

Age 11 to 14
Challenge Level

The large rectangle is divided into a series of smaller quadrilaterals and triangles. Can you untangle what fractional part is represented by each of the ten numbered shapes?

Oh for the Mathematics of Yesteryear

Age 11 to 14
Challenge Level

A garrison of 600 men has just enough bread ... but, with the news that the enemy was planning an attack... How many ounces of bread a day must each man in the garrison be allowed, to hold out 45. . . .

Ratios and Dilutions

Age 14 to 16
Challenge Level

Scientists often require solutions which are diluted to a particular concentration. In this problem, you can explore the mathematics of simple dilutions

A Chance to Win?

Age 11 to 14
Challenge Level

Imagine you were given the chance to win some money... and imagine you had nothing to lose...

Exact Dilutions

Age 14 to 16
Challenge Level

Which exact dilution ratios can you make using only 2 dilutions?

Golden Thoughts

Age 14 to 16
Challenge Level

Rectangle PQRS has X and Y on the edges. Triangles PQY, YRX and XSP have equal areas. Prove X and Y divide the sides of PQRS in the golden ratio.

Six Notes All Nice Ratios

Age 14 to 16
Challenge Level

The Pythagoreans noticed that nice simple ratios of string length made nice sounds together.

The Fastest Cyclist

Age 14 to 16
Challenge Level

Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?

Pythagoras’ Comma

Age 14 to 16
Challenge Level

Using an understanding that 1:2 and 2:3 were good ratios, start with a length and keep reducing it to 2/3 of itself. Each time that took the length under 1/2 they doubled it to get back within range.

Dilution Series Calculator

Age 14 to 16
Challenge Level

Which dilutions can you make using 10ml pipettes and 100ml measuring cylinders?

Conical Bottle

Age 14 to 16
Challenge Level

A right circular cone is filled with liquid to a depth of half its vertical height. The cone is inverted. How high up the vertical height of the cone will the liquid rise?

Same Height

Age 14 to 16
Challenge Level

A trapezium is divided into four triangles by its diagonals. Can you work out the area of the trapezium?

Circuit Training

Age 14 to 16
Challenge Level

Mike and Monisha meet at the race track, which is 400m round. Just to make a point, Mike runs anticlockwise whilst Monisha runs clockwise. Where will they meet on their way around and will they ever. . . .

Slippage

Age 14 to 16
Challenge Level

A ladder 3m long rests against a wall with one end a short distance from its base. Between the wall and the base of a ladder is a garden storage box 1m tall and 1m high. What is the maximum distance. . . .

Mixed up Mixture

Age 14 to 16
Challenge Level

Can you fill in the mixed up numbers in this dilution calculation?

Tin Tight

Age 14 to 16
Challenge Level

What's the most efficient proportion for a 1 litre tin of paint?

Hello Again

Age 11 to 14
Challenge Level

Anne completes a circuit around a circular track in 40 seconds. Brenda runs in the opposite direction and meets Anne every 15 seconds. How long does it take Brenda to run around the track?

Mixing Paints

Age 11 to 14
Challenge Level

Can you work out how to produce different shades of pink paint?

Eight Ratios

Age 14 to 16
Challenge Level

Two perpendicular lines lie across each other and the end points are joined to form a quadrilateral. Eight ratios are defined, three are given but five need to be found.

Number Lines in Disguise

Age 7 to 14
Challenge Level

Some of the numbers have fallen off Becky's number line. Can you figure out what they were?

Sitting Pretty

Age 14 to 16
Challenge Level

A circle of radius r touches two sides of a right angled triangle, sides x and y, and has its centre on the hypotenuse. Can you prove the formula linking x, y and r?

How Big?

Age 11 to 14
Challenge Level

If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?

Equal Temperament

Age 14 to 16
Challenge Level

The scale on a piano does something clever : the ratio (interval) between any adjacent points on the scale is equal. If you play any note, twelve points higher will be exactly an octave on.

Speeding Boats

Age 14 to 16
Challenge Level

Two boats travel up and down a lake. Can you picture where they will cross if you know how fast each boat is travelling?

Zin Obelisk

Age 11 to 14
Challenge Level

In the ancient city of Atlantis a solid rectangular object called a Zin was built in honour of the goddess Tina. Your task is to determine on which day of the week the obelisk was completed.

Mixing Lemonade

Age 11 to 14
Challenge Level

Can you work out which drink has the stronger flavour?

A Scale for the Solar System

Age 14 to 16
Challenge Level

The Earth is further from the Sun than Venus, but how much further? Twice as far? Ten times?

Mixing More Paints

Age 14 to 16
Challenge Level

Can you find an efficent way to mix paints in any ratio?

Square Pegs

Age 11 to 14
Challenge Level

Which is a better fit, a square peg in a round hole or a round peg in a square hole?

Two Ladders

Age 14 to 16
Challenge Level

Two ladders are propped up against facing walls. The end of the first ladder is 10 metres above the foot of the first wall. The end of the second ladder is 5 metres above the foot of the second. . . .

Rhombus in Rectangle

Age 14 to 16
Challenge Level

Take any rectangle ABCD such that AB > BC. The point P is on AB and Q is on CD. Show that there is exactly one position of P and Q such that APCQ is a rhombus.

Half a Triangle

Age 14 to 16
Challenge Level

Construct a line parallel to one side of a triangle so that the triangle is divided into two equal areas.

Triathlon and Fitness

Age 11 to 14
Challenge Level

The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?

Pi, a Very Special Number

Age 7 to 14

Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.

Investigating the Dilution Series

Age 14 to 16
Challenge Level

Which dilutions can you make using only 10ml pipettes?

Straw Scaffold

Age 11 to 14
Challenge Level

Build a scaffold out of drinking-straws to support a cup of water

Retiring to Paradise

Age 11 to 14
Challenge Level

When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?

At a Glance

Age 14 to 16
Challenge Level

The area of a regular pentagon looks about twice as a big as the pentangle star drawn within it. Is it?

A Shade Crossed

Age 14 to 16
Challenge Level

Find the area of the shaded region created by the two overlapping triangles in terms of a and b?

Semi-square

Age 14 to 16
Challenge Level

What is the ratio of the area of a square inscribed in a semicircle to the area of the square inscribed in the entire circle?