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?
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?
Debasing the Coinage
Stage: 3 Short Challenge Level:
There are 100 5p's in £5. The old coins weighed $100
\times 5.65 = 565$g, while the new coins weigh $100 \times 3.25 =
325$g. So your pocket weighs $565-325=240$g lighter.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.