Question

the floor of a rectangular hall has a perimeter 236 m its height is 4.5 m find the cost of paining its four walls at the rate of 8.40 per square m

Answer 1

Perimeter=236m
height= 4.5m
Length= ?
Breadth=?
= 2(x+x)=236
2(2x)=236
4x=236
x=236/4
x= 118/2
x=59
So,area of 4 walls =
$2 \times l + b \times h$
= 2×59+59×4.5
= 2×118×4.5
= 1072m
is the area of 4 walls
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