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In order to answer this question you should first set up a general equation

3/10 of X (the number we want) = 15

When you see of in a mathematical question it generally means to multiply so...

(3/10)X = 15

you should start by getting rid of the fraction. To do this we need to multiply both sides by 10.

3X = 150

Then we need to divide by 3 to isolate the number that we want or X

X = 50

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Q: Three tenths of what number is 15?
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