Question

Find the cost of painting 3 iron boxes at the rate of rs5 per square metre, whose dimensions are
15 m 0.85 m 0.20 m, 2 m * 0.65 m * 0.35 m and 2 m 0.90 mx 0.45 m.​

Answer 1

Total cost of painting=(Total Surface Area Of Box 1 +total surface Area pf Box 2 + Total surface Area of Box 3)*cost per sq.m.

=(15*0.85*0.20 + 2*0.65*0.35 + 2*0.90*0.45)*5

=(2.55+0.455+0.81)*5

=(3.815)*5

=19.075

=Rs.19.075

Therefore cost og painting 3 boxes is Rs.19.075