Question

A room is 12 m by 10 m by 10 m. Find the cost
of covering its floor with bricks 20 cm by 6 cm, if
the cost of one thousand bricks is 300.​

Answer 1

A room is 12 m by 10 m by 10 m. Find the cost  of covering its floor with bricks 20 cm by 6 cm, if  the cost of one thousand bricks is ₹300.​

Your answer is ₹3,00,000. The explanation is as follows:

12*10*10 = volume of the room = Lbh

then, area = Lb = 12*10= 120 sq.m = 12000 sq.cm

Area of bricks = 20*6 = 120 sq.cm

Therefore, 12000/120 = 1000 bricks

Given, cost of 1 brick = Rs.300/-

Then, total cost of bricks = 300*1000 = Rs.3,00,000/-