Answer:
Caitlin equals 55
Explanation:
t= the money troy earned
c =money caitlin earned
The sum of their earnings was 80
t+c = 80
last month caitlin earned $5 more than twice what troy earned
c = 2t+5
We have 2 equations and 2 unknowns
Substitute the second equation into the first
t+c= 80
t+2t+5 = 80
Combine like terms
3t+5 = 80
Subtract 5 from each side
3t+5-5 = 80-5
3t = 75
Divide by 3
3t/3 = 75/3
t =25
Now we need to calculate c
c = 2(25)+5
c = 50 +5
c =55