Question

Find the cost of papering the walls of a room $10$ metre long $5$ metres broad and $5$ metre high with paper $75$ cm wide at $90$ paise per metre.

Answer 1

Area of the four walls $=2(10+5)\times 5m^2$
$=150m^2$
width of the paper $=75cm$
$=\frac{3}{4}metre$
$\therefore$ length of the paper $=(150÷\frac{3}{4})m$
$=200metre$
$\therefore$ cost of papering the walls $=200\times 90$ paise
=Rs.180