Question

a wooden sheet is 15 M long and 6 metre broad it has to been painted on both sides find the cost of painting with @ rupees 30 per square metre

Answer 1

area = 2×2(l+b) = 4(15+6) = 4(21) = 84cm²
cost = 84×30 = 2520Rs.

Answer 2

area of one side= length x breadth
= 15 x 6= 90cm^2

area of both sides= 2 x 90
= 180 cm^2

cost/m^2 = 30 rs.

total cost = 180 x 30
= rs. 5400