Question

4. A swimming pool has the dimensions 30 m x 25 m x 12 m. Find the cost of
cementing its floor and walls at the rate of 32 per square metre.
8. The floor of an auditorium has a perimeter of 300 m. If its height is 8 m, find
the cost of painting its four walls at the rate of ? 15 per square metre.​

Answer 1

for 1st question

>> length = 30 metre

>> breadth = 25 metre

>> height = 12 metre

volume of cuboid = l × b × h

= 30 × 25 × 12

= 9000 square metre

1 square metre = 32 ₹

9000 square metre = ? ₹

>> 9000 × 32

>> 288000 ₹