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Var in answer choice

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Var in answer choice [#permalink] New post 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.

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

Specifically the plus 1 confuses me.  Help

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Re: Var in answer choice [#permalink] New post 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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Re: Var in answer choice   [#permalink] 10 Aug 2010, 15:53
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