Question

A rectangular room is 5 m long , 4 m wide and 3 m high. Find the cost of white

washing its walls at the rate of Rs 15 per square metre​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

₹ 1110

Step-by-step explanation:

Area of four walls of a room= 2h(l+b)

                                              = 2×3(5+4)  

                                              = 6×9

                                              = 54sq.m.

Area of roof=l×b

                   = 5×4

                   = 20sq.m.

Total area= 54+20

                = 74 sq.m.

Cost of white washing is rupees 15 per sq.m.

Hence, the cost of white washing 74 sq.m.= 74 × 15

                                                                        = ₹ 1110

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