Question

The cost of painting a wall is rupees 336 at the rate of rupees 2 per square metre. Find it's length , if the breadth is 120 cm.

Answer 1

area = 336÷2
= 168m2
b= 120cm= 1.2 m
a=l*b
l = 168÷1.2
l = 140m

Answer 2

amount spent on total painting=rs 336
rate of painting it is=rs 2 per square metre
total area it has painted = 336/2= 168 m
area in cm= 16800cm
if breadth of the wall is 120cm
length let it be x
2 (x+120)=16800
2x+240=16800
2x=16560
x=16560/2
=8280cm
thus the length is 8280cm.