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Tree Tops

A manager of a forestry company has to decide which trees to plant. What strategy for planting and felling would you recommend to the manager in order to maximise the profit?

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Thirty Nine, Seventy Five

We have exactly 100 coins. There are five different values of coins. We have decided to buy a piece of computer software for 39.75. We have the correct money, not a penny more, not a penny less! Can you discover what the five different types of coins are worth and how many of each we have saved?

Weekly Problem 28 - 2009

Stage: 3 Short Challenge Level: Challenge Level:1

4 star petrol at $s$ pence per litre costs 3 pence per litre more than unleaded. How many pence does it cost to buy $u$ litres of unleaded petrol?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

 

 

This problem is taken from the UKMT Mathematical Challenges.

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