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# Var in answer choice

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Manager
Joined: 24 May 2010
Posts: 83
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Var in answer choice [#permalink]

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10 Aug 2010, 15:40
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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.

Answer is (t+2)/j. +1

Specifically the plus 1 confuses me.  Help

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Senior Manager
Status: Time to step up the tempo
Joined: 24 Jun 2010
Posts: 408
Location: Milky way
Schools: ISB, Tepper - CMU, Chicago Booth, LSB
Followers: 8

Kudos [?]: 171 [0], given: 50

Re: Var in answer choice [#permalink]

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10 Aug 2010, 16:53
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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Re: Var in answer choice   [#permalink] 10 Aug 2010, 16:53
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# Var in answer choice

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