The surface area of a cube is 150 cm2. Its volume is :
a) 64 $${\text{c}}{{\text{m}}^3}$$
b) 125 $${\text{c}}{{\text{m}}^3}$$
c) 150 $${\text{c}}{{\text{m}}^3}$$
d) 216 $${\text{c}}{{\text{m}}^3}$$
Answer: b
Explanation:
$$\eqalign{
& 6{a^2} = 150 \cr
& {a^2} = 25 \cr
& a = 5 \cr} $$
Volume :
$${a^3} = {5^3} = 125\,{\text{ c}}{{\text{m}}^3}$$
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