The base of a cylindrical vessel has circumference 132 cm and the vessel is 25 cm deep. How many litres of water does it hold when full? Take π = 22/7.

2π$r=132$ gives $r=(132\times 7)/44=21$ cm, so the volume = $(22/7)\times 441\times 25=1386\times 25=34650{\text{cm}}^3$. Since $1000{\text{cm}}^3=1$ litre, that is 34.65 litres. (34650 leaves the answer in ${\text{cm}}^3$; dividing by 100 gives 346.5 and dividing by 10000 gives 3.465 — the divisor is 1000.)