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# What is the average age of the two children?

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Math Expert
Joined: 02 Sep 2009
Posts: 55148
What is the average age of the two children?  [#permalink]

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03 Jul 2017, 04:57
00:00

Difficulty:

35% (medium)

Question Stats:

84% (01:28) correct 16% (00:40) wrong based on 27 sessions

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What is the average age of the two children?

(1) In 2003, the average age of a family of four adults was 25 years.
(2) In 2013, the average age of the family of four adults and two children was 25 years.

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Joined: 05 Mar 2015
Posts: 998
Re: What is the average age of the two children?  [#permalink]

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03 Jul 2017, 08:51
Bunuel wrote:
What is the average age of the two children?

(1) In 2003, the average age of a family of four adults was 25 years.
(2) In 2013, the average age of the family of four adults and two children was 25 years.

(1) no info of children...clearly insuff

(2) (4 adult + 2 child) / 6 =25

4 adult + 2 child = 150 ....means sum of 4 adult + 2 child ages = 150
No breakup of ages....insuff

Combining ..
if 4 adults have sum of ages = 100 in 2003
then in 2013 ,4 adults have sum of ages = 100+ 4*10 (4 adults in 10 yrs) = 140-----(x)
thus ..as sum of 4 adult + 2 child ages = 150 ------(y)

substituting value from (x) in (y)

140+2 children = 150
2 child = 150- 140 =10
avg. age of 2 child =5
suff

Ans C
Re: What is the average age of the two children?   [#permalink] 03 Jul 2017, 08:51
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