Question

A classroom is 12m long ,7 m high and 4 m wide. Find the cost of reparing the walls and ceiling at rate of ₹ 15 per square metre

Answer 1

Area to be repaired= csa+ area of ceiling
=2( l+ b) h +( l* b)
=[2(12+7)*4]+(12*7)
=(8*19)+84
=152+84
=236 m^2
cost of repairing 1 m^2=₹15
cost of repairing 234 m^2=₹(15*236)
=₹3540
hope it helps you

Answer 2

area of classroom=2(12+4)×7+(12×4)
32×7=224m2+12×4
cost=266×15=3990rs
hope it helps you