Question

16. The dimensions of a room are 8.6mx 6.4mx4m it has two doors each measuring 2 m by 1 and
four equal windows in the shape of squares. If the cost of painting the four wall is Rs 4480 at
Rs 40 per m², find the size of the windows​

Answer 1

Answer:

total area=area of 4 walls -area of 2 doors - area of 4 windows

A=2 (bh+hl)-2 (2×1)-4a^2

total cost=Rs4480

4480=40 (120-4-4a^2)

112=116-4a^2

4a^2=4

a=1

measure of window is 1m x 1m