18 is 45% of what ?

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Answer 1 · 2018-04-20T00:17:08

$40$ $40$

$\frac{18}{40}$ $18/40$ will give you $0.45$ $0.45$ , which is equal to $45 %$ $45%$ .

How to solve it:

Answer 2 · 2018-04-20T00:19:30

$40$ $40$

The proportion I like to use with these types of problems goes like:

$\frac{percent}{100} = \frac{part}{whole}$ $"percent"/100 = "part"/"whole"$

Part/whole can also be written as "is/of"

So in this case:

Now:

$\frac{45}{100} = \frac{18}{x}$ $45/100 = 18/x$

We can cross multiply to get:

$45 x = 1800$ $45x = 1800$

$x = 40$ $x = 40$

Hope this helps!

Answer 3 · 2018-04-20T00:21:53

$18$ $18$ is $45 %$ $45%$ of $40$ $40$ .

Let $x$ $x$ represent the unknown number.

$45 % = \frac{45}{100} = 0.45$ $45%=45/100=0.45$

$0.45 x = 18$ $0.45x=18$

Divide both sides by $0.45$ $0.45$ .

$x = \frac{18}{0.45}$ $x=18/(0.45)$

$x = 40$ $x=40$

Check.

$0.45 (40) = 18$ $0.45(40)=18$

$18$ $18$ is $45 %$ $45%$ of $40$ $40$ .