70 is what percent of 315 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 315 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 315, so we can write it down as 100%=315.
4. We know, that x% equals 70 of the output value, so we can write it down as x%=70.
5. Now we have two simple equations:
1) 100%=315
2) x%=70
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=315/70
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 70 is what percent of 315

100%/x%=315/70
(100/x)*x=(315/70)*x       - we multiply both sides of the equation by x
100=4.5*x       - we divide both sides of the equation by (4.5) to get x
100/4.5=x
22.222222222222=x
x=22.222222222222

now we have:
70 is 22.222222222222% of 315