What number is 30% of 50?
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50 * .30= 15
 
so 15 is 30% of 50

hope this helped :)

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

1. We assume, that the number 50 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 50 is 100%, so we can write it down as 50=100%. 
4. We know, that x is 30% of the output value, so we can write it down as x=30%. 
5. Now we have two simple equations:
1) 50=100%
2) x=30%
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:
50/x=100%/30%
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 30% of 50

50/x=100/30
(50/x)*x=(100/30)*x       - we multiply both sides of the equation by x
50=3.33333333333*x       - we divide both sides of the equation by (3.33333333333) to get x
50/3.33333333333=x 
15=x 
x=15

now we have: 
30% of 50=15

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