120 is 30% of what number?

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Answer 1 · 2016-11-09T14:00:44

The number is $400$ $400$

Let $x$ $x$ be "what number". We can then write this problem as:

$30 %$ $30%$ of $x = 120$ $x = 120$

or

$\frac{30}{100} x = 120$ $30/100 x = 120$

Solveing for $x$ $x$ while keeping the equation balanced gives:

$\frac{100}{30} \frac{30}{100} x = 120 \frac{100}{30}$ $100/30 30/100 x = 120 100/30$

$x = \frac{12000}{30}$ $x = 12000/30$

$x = 400$ $x = 400$