What is 75% of 40?

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What is 75% of 40?

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Answer 1 · 2015-06-01T19:15:55

75% of 40 is 30

Let's start by setting up a relationship that we're solving for. If a number $x$ $x$ is 75% of another number, than their ratio would be $\frac{75}{100}$ $75/100$

So:
$\frac{x}{40} = \frac{75}{100}$ $x/40 = 75/100$

Now we cross multiply to get rid of the denominator:

$100 \cdot x = 75 \cdot 40$ $100*x = 75 * 40$

$100 \cdot x = 300$ $100*x = 300$

Divide both sides by 100:

$\frac{100 \cdot x}{100} = \frac{300}{100}$ $(100*x)/100 = 300/100$

And are left with x:

$x = 30$ $x = 30$

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What is 75% of 40?

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