## 280. Math Puzzle $9 / 88$

A plumber makes a cubic, open-top metal container that holds 501 liters of water.

How many $\mathrm{m}^{2}$ of sheet metal does he need, disregarding overlaps and waste?
From $V=a^{3}$ it follows that $a=\sqrt[3]{V}=37 \text{ cm}$.

$A_{O}=5 \cdot(37 \text{ cm})^{2}=5 \cdot 1369 \text{ cm}^{2}=0.68 \text{ m}^{2}$

$0.68 \text{ m}^{2}$ of sheet metal is required.