Number 8
3 marks · EasyA tank contains 18 litres of water. Each glass holds 250 millilitres (ml) of water.
Work out how many glasses can be completely filled from the 18 litres.
How much water, in millilitres, will be left over after filling the glasses?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) 72
(b) 0 ml
Common mistakes: Not converting litres to millilitres; Dividing incorrectly
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Converts 18 litres to millilitres (18 × 1000 = 18000 ml).
A1 (a) · 1 mark · Correct calculation of number of glasses: 18000 ÷ 250 = 72.
A2 (b) · 1 mark · States there is 0 ml left over (no remainder after full glasses). (follow-through)
Worked solution
a) 1 litre = 1000 ml, so 18 litres = 18 × 1000 = 18000 ml.
So 72 glasses can be completely filled.
b) 72 × 250 = 18000 ml, so no water left over.