Determine the missing value.

a) Output value/Efficiency: 100 J
Efficiency: 100%

Input E = ???

b) Input: 100 J Efficiency: 30%
Output E = ??
Output= 30 J

c) Output E: 120 000 J
Efficiency: 2%
Input E= ??

How would I solve for the put value?
Thank you!

2 answers

a. Eo/Ei = 1.0
100/Ei = 1
Solve for Ei.

b. Eo/Ei = 0.30
Eo/100 = 0.30
Solve for Eo.

c. Same procedure as a and b.
Thanks :D