Answer:
Step-by-step explanation:
If you set up a proportion, this will make sense.

Now, Cross Multiply
6x = 12.5
x = 25/12
What do you need help with?
You’ll do it in reverse here so
$64 + $40 = $104
if he spent 4/5 on car repairs then had a remaining $104, the 1/5 is equal to $104.
multiply $104 by 5 and it gives you $520
his paycheck was $520