Question

Find the volume of a cubical box if the cost of painting its outer surface is rs.1440 at the rate of rs.15 per sq. M.

Answer 1

total surface cube = 1440÷15
=96
tsa of cube =
$6x ^{2}$
6x^2 = 96
x=4

vol of cube =
${x}^{3}$
hence
vol of cube = 4^3
= 64

Answer 2

Answer:

total surface cube = 1440÷15

=96

tsa of cube =

6x ^{2}6x

2

6x^2 = 96

x=4

vol of cube =

{x}^{3}x

3

hence

vol of cube = 4^3

= 64