Ratio, Proportion and rates of change

Do you have enough information to work out the area of the shaded quadrilateral?

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

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

If a sum invested gains 10% each year how long before it has doubled its value?

Your school has been left a million pounds in the will of an ex- pupil. What model of investment and spending would you use in order to ensure the best return on the money?

My measurements have got all jumbled up! Swap them around and see if you can find a combination where every measurement is valid.

Here's a chance to work with large numbers...

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

Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?

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

These Olympic quantities have been jumbled up! Can you put them back together again?

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?