A person inherited few gold coins from his father. If he : GMAT Data Sufficiency (DS)
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# A person inherited few gold coins from his father. If he

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A person inherited few gold coins from his father. If he [#permalink]

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13 May 2012, 07:13
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A person inherited few gold coins from his father. If he put 9 coins in each bag then 7 coins are left over. However if he puts 7 coins in each bag then 3 coins are left over. What is the number of coins he inherited from his father.

(1) The number of coins lies between 50 to 120.
(2) If he put 13 coins in each bag then no coin is left over and number of coins being lesser than 200.
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Re: A person inherited a few gold coins from his father [#permalink]

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13 May 2012, 22:32
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If C = number of coins then C = 7m+3 = 9n + 7, where m and n are the number of bags used in the 7 coins per bag and 9 coins per bag case respectively.

Using statement (1), C lies between 50 and 120. However, 52 and 115 both satisfy the condition. Insufficient.

Using statement (2), C is less than 200. Only 52 satisfies all three conditions. Sufficient.

B it is.
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13 May 2012, 23:28
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A person inherited few gold coins from his father. If he put 9 coins in each bag then 7 coins are left over. However if he puts 7 coins in each bag then 3 coins are left over. What is the number of coins he inherited from his father.

If he puts 9 coins in each bag then 7 coins are left over --> $$c=9q+7$$, so # of coins can be: 7, 16, 25, 34, 43, 52, 61, ...
If he puts 7 coins in each bag then 3 coins are left over --> $$c=7p+3$$, so # of coins can be: 3, 10, 17, 24, 31, 38, 45, 52, 59, ...

General formula for $$c$$ based on above two statements will be: $$c=63k+52$$ (the divisor should be the least common multiple of above two divisors 9 and 7, so 63 and the remainder should be the first common integer in above two patterns, hence 52). For more about this concept see: manhattan-remainder-problem-93752.html#p721341, when-positive-integer-n-is-divided-by-5-the-remainder-is-90442.html#p722552, when-the-positive-integer-a-is-divided-by-5-and-125591.html#p1028654

$$c=63k+52$$ means that # of coins can be: 52, 115, 178, 241, ...

(1) The number of coins lies between 50 to 120 --> # of coins can be 52 or 115. Not sufficient.

(2) If he put 13 coins in one bag then no coin is left over and number of coins being lesser than 200 --> # of coins is a multiple of 13 and less than 200: only 52 satisfies this condition. Sufficient.

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Re: A person inherited few gold coins from his father. If he [#permalink]

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06 Jun 2013, 05:10
Bumping for review and further discussion*. Get a kudos point for an alternative solution!

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Re: A person inherited few gold coins from his father. If he [#permalink]

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06 Jun 2013, 16:25
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gmihir wrote:
A person inherited few gold coins from his father. If he put 9 coins in each bag then 7 coins are left over. However if he puts 7 coins in each bag then 3 coins are left over. What is the number of coins he inherited from his father.

(1) The number of coins lies between 50 to 120.
(2) If he put 13 coins in one bag then no coin is left over and number of coins being lesser than 200.

Please correct the question the 2nd statement should mention each bag.
((2) If he put 13 coins in each bag then no coin is left over and number of coins being lesser than 200.[/quote])
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Re: A person inherited few gold coins from his father. If he [#permalink]

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05 Aug 2014, 20:01
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 person inherited few gold coins from his father. If he [#permalink]

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11 Aug 2014, 04:59
HI Bunuel:

I understand that this theorem is " Chinese Theorem".
C=63K + 52 is obtained by C = (9*7) K + 52.
52 is found by looking at both the lists.
However, I remember reading a shortcut to arrive at 52 as well. But not able to recall now.

Can u please describe the shortcut here.
(This will help saving extra seconds in gmat).

Thanks
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Re: A person inherited few gold coins from his father. If he [#permalink]

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11 Aug 2014, 21:03
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Bunuel wrote:
A person inherited few gold coins from his father. If he put 9 coins in each bag then 7 coins are left over. However if he puts 7 coins in each bag then 3 coins are left over. What is the number of coins he inherited from his father.

If he puts 9 coins in each bag then 7 coins are left over --> $$c=9q+7$$, so # of coins can be: 7, 16, 25, 34, 43, 52, 61, ...
If he puts 7 coins in each bag then 3 coins are left over --> $$c=7p+3$$, so # of coins can be: 3, 10, 17, 24, 31, 38, 45, 52, 59, ...

General formula for $$c$$ based on above two statements will be: $$c=63k+52$$ (the divisor should be the least common multiple of above two divisors 9 and 7, so 63 and the remainder should be the first common integer in above two patterns, hence 52). .

Awesome!!! I have never known about the formula before. Thanks a ton, Bunuel!!!!!!
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Re: A person inherited few gold coins from his father. If he [#permalink]

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03 Oct 2015, 15:53
Hello from the GMAT Club BumpBot!

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Re: A person inherited few gold coins from his father. If he [#permalink]

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13 Nov 2016, 15:38
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 person inherited few gold coins from his father. If he   [#permalink] 13 Nov 2016, 15:38
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