70 is what percent of 220 - 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 220 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 220, so we can write it down as 100%=220.
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%=220
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%=220/70
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 220

100%/x%=220/70
(100/x)*x=(220/70)*x       - we multiply both sides of the equation by x
100=3.14285714286*x       - we divide both sides of the equation by (3.14285714286) to get x
100/3.14285714286=x
31.8181818182=x
x=31.8181818182

now we have:
70 is 31.8181818182% of 220