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# A family has a child every j years.  The oldest child is t years old.

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Manager
Joined: 24 May 2010
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A family has a child every j years.  The oldest child is t years old. [#permalink]

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10 Aug 2010, 14:40
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A family has a child every j years.  The oldest child is t years old. If they have a child 2 years from now, how many children will they have in total.

[Reveal] Spoiler:
(t+2)/j +1

Kudos [?]: 61 [0], given: 1

Senior Manager
Status: Time to step up the tempo
Joined: 24 Jun 2010
Posts: 403

Kudos [?]: 269 [0], given: 50

Location: Milky way
Schools: ISB, Tepper - CMU, Chicago Booth, LSB
Re: A family has a child every j years.  The oldest child is t years old. [#permalink]

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10 Aug 2010, 15:53
My attempt:

When the couple have their 2 kid, their eldest kid will he J years old.

Hence the number of kids = t/j + 1 (new born infant).

= j/j +1 ==> 2

When the couple have their 3rd kid, their eldest kid will be 2J years old.

Hence the number of kids = t/j + 1 (new born infant).

= 2j/j +1 ==> 3

The +1 is for the new born infant.
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Kudos [?]: 269 [0], given: 50

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Re: A family has a child every j years.  The oldest child is t years old. [#permalink]

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23 Sep 2017, 22:03
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A family has a child every j years.  The oldest child is t years old.   [#permalink] 23 Sep 2017, 22:03
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