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Juliette [100K]
3 years ago
7

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

Mathematics
2 answers:
Assoli18 [71]3 years ago
8 0
The answer would be D. 
maks197457 [2]3 years ago
8 0
We assume, that the number 50 is 100% - because it's the output value of the task. 
<span>We assume, that x is the value we are looking for. 
</span>If 100% equals 50, so we can write it down as 100%=50. 
<span>We know, that x% equals 20 of the output value, so we can write it down as x%=20. 
</span>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
<span>(100/x)*x=(50/20)*x </span>
<span>100=2.5*x      </span>
<span>100/2.5=x </span>
<span>40=x </span>
<span>x=40</span>
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