Question

. Find the cost of painting the curved surface of a box of dimensions 7mt x5mt x 3mt
at the rate of Rs 20 per m2.

Answer 1

Step-by-step explanation:

Here,l=7m,b=5m,h=3m.

Total surface area =2(lb+bh+lh)

=2(7×5+5×3+7×3)

=2(35+15+21)

=2× 71=142 sq m.

Cost of painting=142×20=Rs.2840 .

Answer 2

Answer:

curved surface area is 72m2. and amount is 1440 rupees

Step-by-step explanation:

curved surface area is 2H(L+B)

2*3(7+5)M2

6*12M2

72M2

If 1 M2 is ₹20 then 72m2 is ₹(72*20) is ₹1440.

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