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# If 10% of the adults have no children, what is the ratio of adults wit

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04 May 2017, 02:31
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86% (00:25) correct 14% (00:37) wrong based on 79 sessions

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If 10% of the adults at the mall have no children, what is the ratio of adults with children to adults without children at the mall?

A. 1 : 9
B. 2 : 3
C. 3 : 2
D. 3 : 4
E. 9 : 1
[Reveal] Spoiler: OA

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Re: If 10% of the adults have no children, what is the ratio of adults wit [#permalink]

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04 May 2017, 04:58
Expert's post
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Bunuel wrote:
If 10% of the adults at the mall have no children, what is the ratio of adults with children to adults without children at the mall?

A. 1 : 9
B. 2 : 3
C. 3 : 2
D. 3 : 4
E. 9 : 1

Let's say there is a TOTAL of 100 adults at the mall.

10% of the adults at the mall have no children
10% of 100 = 10, so 10 adults have NO children.
This means the number of adults WITH children = 100 - 10 = 90

What is the ratio of adults with children to adults without children at the mall?
The ratio = 90 to 10
= 9 : 1

[Reveal] Spoiler:
A

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06 May 2017, 07:24
Bunuel wrote:
If 10% of the adults at the mall have no children, what is the ratio of adults with children to adults without children at the mall?

A. 1 : 9
B. 2 : 3
C. 3 : 2
D. 3 : 4
E. 9 : 1

Algebraically:

Let X be total # of adults at the mall

X - 10X = .90X

Ratio of WITH to WITHOUT =

.90X/.10X = 9/1 or 9:1
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06 May 2017, 11:42
If 10% of the adults at the mall have no children, what is the ratio of adults with children to adults without children at the mall?

Let total number of adults = 100
Adults who have no children = 10% of 100 = $$\frac{10}{100}$$ x 100 = 10
Therefore adults with children = 100-10 = 90

Hence the required ratio = adults with children / adults without children = $$\frac{90}{10}$$ = $$\frac{9}{1}$$ or 9:1.

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Re: If 10% of the adults have no children, what is the ratio of adults wit [#permalink]

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06 May 2017, 16:58
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Expert's post
Bunuel wrote:
If 10% of the adults at the mall have no children, what is the ratio of adults with children to adults without children at the mall?

A. 1 : 9
B. 2 : 3
C. 3 : 2
D. 3 : 4
E. 9 : 1

We are given that 10% of the adults at the mall have no children, which means that 90% have children.

Therefore, the ratio of adults with children to those without children = 90 : 10 = 9 : 1.

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Re: If 10% of the adults have no children, what is the ratio of adults wit [#permalink]

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18 May 2017, 03:05
let number of adults be 100

hence without children is 10 and with children is 90 => ratio is 90:10= 9:1

Hence E is Correct Option
Re: If 10% of the adults have no children, what is the ratio of adults wit   [#permalink] 18 May 2017, 03:05
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