Two temperature scales A and B are related by :
`(A-42)/(110)=(B-72)/(220)`
At which temperature two scales have the same reading ?

Options

A. `-42^(@)`
B. `-72^(@)`
C. `+12^(@)`
D. `-40^(@)`

Answer

C

Explanation

We are given the reation between the tempeature scales A and B as `(A-42)/(110)=(B-72)/(220)` , so for the two scales to have the same reading A = B and so `(A-42)/(110)=(A-72)/(220)` which yields A=12.