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# 36 percent of 18 is 18 percent of what number?

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Math Expert
Joined: 02 Sep 2009
Posts: 58464
36 percent of 18 is 18 percent of what number?  [#permalink]

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14 Jan 2019, 03:46
1
1
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Difficulty:

15% (low)

Question Stats:

85% (00:53) correct 15% (02:24) wrong based on 33 sessions

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36 percent of 18 is 18 percent of what number?

A. 9
B. 24
C. 36
D. 40
E. 48

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Re: 36 percent of 18 is 18 percent of what number?  [#permalink]

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14 Jan 2019, 04:02
$$\frac{36}{100} * 18$$ = $$\frac{18}{100} * x$$

$$\frac{9}{25} * 1$$ = $$\frac{1}{100} * x$$

$$9 * 1$$ = $$\frac{1}{4} * x$$

x = 36

OPTION: C
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Re: 36 percent of 18 is 18 percent of what number?  [#permalink]

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14 Jan 2019, 04:28
Bunuel wrote:
36 percent of 18 is 18 percent of what number?

A. 9
B. 24
C. 36
D. 40
E. 48

0.36 * 18 = .18 *x

x= 36
IMO C
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Re: 36 percent of 18 is 18 percent of what number?  [#permalink]

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17 Jan 2019, 18:58
36 percent of 18 is 18 percent of what number?
This can be quick recognition that the number needs to be doubled.

I'm never confident with these acts of quick recognition, so the equation

$$\frac{36}{100}·18=\frac{18}{100}·x$$
Multiply both sides by 100
36·18=18·x
Divide both sides by 18
36=x
Re: 36 percent of 18 is 18 percent of what number?   [#permalink] 17 Jan 2019, 18:58
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