You work in a materials testing lab and your boss tells you to increase the temperature of a sample by `40.0^@ C`. The only thermometer you can find at your workbench reads in .^@ F`. If the initial temperature of the sample is `68.2^@ F`. What is its temperature in .^@ F` when the desired temperature increase has been achieved ?

Answer

A, B, D

Explanation

Initially `T_C = ((T_F - 32)/(180)) (100)`
=`((68.2 - 32)/(180)) (100)`
= `20.11^@ C`
Finally `T_C = 20.11 + 40 = 60.11^@ C`
`:. T_F = 32 + ((180)/(100))T_C`
= `32 + ((180)/(100)) (60.11)`
= `140.2^@ F`.