### Oh for the Mathematics of Yesteryear

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 days against the siege of the enemy?

### 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?

### History of Money

If you would like a new CD you would probably go into a shop and buy one using coins or notes. (You might need to do a bit of saving first!) However, this way of paying for the things you want did not always exist. Find out more ...

# Thirty Nine, Seventy Five

##### Stage: 3 Challenge Level:

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?