How many m3 of soil has to be excavated from a rectangular well 28cm d

1.	How many m3 of soil has to be excavated from a rectangular well 28cm deep and whose base dimensions are 10cm and 8m. Also, find the cost of plastering its vertical walls at the rate of Rs. 15/m2.
Answer» = 10m b = 8 h = 28m Volume of soil = volume of cuboid = l × b × h = 10 × 8 × 28 = 2240 m³ 2240 m³ of soil has to be excavated. Area to be plastered = L.S.A of cuboid = 2h(l + b) = 2 ×28(10 + 8) = 56 × 18 = 1008m² The cost of plastering 1m² = Rs. 15 ∴The cost of plastering = 15 × 1008 = Rs. 15,120

How many m3 of soil has to be excavated from a rectangular well 28cm deep and whose base dimensions are 10cm and 8m. Also, find the cost of plastering its vertical walls at the rate of Rs. 15/m2.

Answer»

= 10m

b = 8

h = 28m

Volume of soil = volume of cuboid

= l × b × h = 10 × 8 × 28 = 2240 m³

2240 m³ of soil has to be excavated.

Area to be plastered = L.S.A of cuboid

= 2h(l + b)

= 2 ×28(10 + 8)

= 56 × 18 = 1008m²

The cost of plastering 1m² = Rs. 15

∴The cost of plastering = 15 × 1008 = Rs. 15,120