Question

what percent of 45 is 20

Answer 1

45/100*20 is the answer.
9 is the answer.
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Answer 2

1. We assume, that the number 20 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 20 is 100%, so we can write it down as 20=100%.
4. We know, that x is 45% of the output value, so we can write it down as x=45%.
5. Now we have two simple equations:
1) 20=100%
2) x=45%
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:
20/x=100%/45%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 45% of 20

20/x=100/45
(20/x)*x=(100/45)*x - we multiply both sides of the equation by x
20=2.22222222222*x - we divide both sides of the equation by (2.22222222222) to get x
20/2.22222222222=x
9=x
x=9

now we have:
45% of 20=9