Question

Salil polishes wooden boxes. Each box is 20cm long, 10 cm wide 5cm high.

He polishes all the 6 faces of the box. He has polished a total of 2800cm^2 area of boxes area of boxes.
How many boxes are polished by him?

Answer 1

Answer:

4 boxes

Step-by-step explanation:

First we need to calculate the total surface area(A) of one box.

A = 2 x (lb + bh + bl) [l,b and h are length, breadth and height of the box ]

   = 2 x [(20)(10) + (10)(5) + (5)(20)]

   = 2 x [200 + 50 + 100]

   = 2 x [350] = 700 $cm^{2}$

Total area Salil polished = 2800 $cm^{2}$

=> No of boxes he polished = $\frac{2800}{700}$ = 4 boxes