13-02-2018
Mathematics

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30%of what number is 9 find the whole

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13-02-2018

We can set up a proportion to find the answer.

[tex] \frac{9}{x} = \frac{30}{100} [/tex]

Cross multiply

[tex]9(100) = 30x[/tex]

Solve for x

[tex]x = \frac{900}{30} [/tex]

x = 30

So 9 is 30% of 30.

The answer is 30.

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13-02-2018

Line up % with % and number with number

30% is 9
100% is ?

Those numbers are in proportion so we can cross multiply to find the missing part of the proportion.

?=100•9/30=30

So 30% of 30 is 9

Answer Link

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