WAEC 2025 · Paper 1 · Q25✱✱

Solid mensuration

A water tank of height $\frac12\text{ m}$ has a square base of side $1\frac12\text{ m}$ . It is filled from a tanker holding 1500 litres. How many litres are left in the tanker?

Worked solution (try it first)

Volume of the tank: $1.5 \times 1.5 \times 0.5 = 1.125\text{ m}^3$ .
$1\text{ m}^3$ is 1000 litres, so the tank takes 1125 litres.
Left in the tanker: $1500 - 1125 = 375$ litres, option A.

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