40 is what percent of 90 - step by step solution

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

1. We assume, that the number 90 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 90, so we can write it down as 100%=90.
4. We know, that x% equals 40 of the output value, so we can write it down as x%=40.
5. Now we have two simple equations:
1) 100%=90
2) x%=40
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%=90/40
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 40 is what percent of 90

100%/x%=90/40
(100/x)*x=(90/40)*x - we multiply both sides of the equation by x
100=2.25*x - we divide both sides of the equation by (2.25) to get x
100/2.25=x
44.4444444444=x
x=44.4444444444

now we have:
40 is 44.4444444444% of 90

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