Question

a room is 5.5m long, 4m wide and 3.5m high. Find the cost of papering its wall with paper 90cm wide at ₹1.20per square metre. ​

Answer 1

Answer

Lateral surface area or area of walls=[2(l+b)×h].                                                      =[2(5.5+4)×3.5]sq units.                           =2×9.5×3.5 sq units.                                     =2×33.25 sq units.                                         =66.50sq units                                              length of paper required for papering the wall=0.9×66.50=59.85m.                         Cost of papering the wall=₹(1.20×59.85)=₹119.7

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