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

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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, 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.

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(t+2)/j +1
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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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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: A family has a child every j years.  The oldest child is t years old.   [#permalink] 10 Aug 2010, 16:53
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