20 is what percent of 50? A. 30% B. 10% C. 250% D. 40%

Mathematics

2 answers:

Assoli18 [71]4 years ago

8 0

The answer would be D.

maks197457 [2]4 years ago

8 0

We assume, that the number 50 is 100% - because it's the output value of the task.
We assume, that x is the value we are looking for.
If 100% equals 50, so we can write it down as 100%=50.
We know, that x% equals 20 of the output value, so we can write it down as x%=20.
Now we have two simple equations:
1) 100%=50
2) x%=20
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%=50/20
Now we just have to solve the simple equation, and we will get the solution we are looking for.

100%/x%=50/20
(100/x)*x=(50/20)*x 
100=2.5*x 
100/2.5=x 
40=x 
x=40

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Step-by-step explanation:

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