It depends. You'd need to give some example, but generally the idea is to put all variables on one side and everything else on the other side.
The amount of money Shai saved:

The amount of money Nyah saved:

The total amount three people saved:

Answer:
fact
Step-by-step explanation:
.................
Answer:
That does what? We need more info pleasee
(35/100)*42= 14.7 days.
This principle apples to all form conversion that requires finding a percentage of a number.