Question

The volume of a cubical tank is 1331 $m^3$. Given that it costs Rs.10 to paint per square meter. Find the cost incurred to paint its complete surface area.

• A. 7260
• B. 7240
• C. 7000
• D. 7280

Answer 1

The correct option is A

7260

Let the side of the given cubical tank be '$a$' metres.
Volume of the given cube is $a^3$
By prime factorisation, we get cube root of 1331 as 11 metres.
Surface area of each face of a cube is $a^2$ .
Total surface area of the cube is $6a^2$.

Cost incurred is then $10\times 6a^2$ = Rs.7260