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The area of four walls of room is given ...

The area of four walls of room is given by A=2h(l+b). Make l as the subject of the formula. Find l when `A=100m^(2)`, h=5m, and b=4m.

A

`l=(A)/(2h)=b,6m`

B

`l=(A)/(2h)-h,5m`

C

`l=(A)/(2b)-h,4m`

D

`l=(A)/(2b)-h,8m`

Text Solution

Verified by Experts

The correct Answer is:
A
`A=2h(l+b)`
`rArr (A)/(2h)=l+brArr(A)/(2h)-b=l`
`rArr l=(A)/(2h)-b`
Given `A=100m^(2), h=5m`, and `b=4m`.
`rArr l=(100)/(2xx5)-4`
`rArr I=6m`
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