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# Someone deposited money for his daughter monthly. In each

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Joined: 19 Aug 2006
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Kudos [?]: 16 [0], given: 0

Someone deposited money for his daughter monthly. In each [#permalink]  15 Nov 2006, 20:56
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Someone deposited money for his daughter monthly. In each month, he deposited a fixed amount more than in the previous month. First month, he deposited $800;the amount deposited in the seventh month is twice of that in the third month. In each month, he deposited how much more than the previous month? GMAT Club Legend Joined: 07 Jul 2004 Posts: 5068 Location: Singapore Followers: 23 Kudos [?]: 194 [0], given: 0 [#permalink] 15 Nov 2006, 21:17 Assuming each month increases by x dollars 1st month = 800 2nd month = 800+x 3rd month = 800+2x ... 7th month = 800+6x We're told: 800+6x = 2(800+2x) 800+6x = 1600 + 4x 2x = 800 x = 400 Manager Joined: 19 Aug 2006 Posts: 222 Followers: 1 Kudos [?]: 16 [0], given: 0 [#permalink] 15 Nov 2006, 22:09 But OA is 800.....How? Can u explain? Senior Manager Joined: 20 Feb 2006 Posts: 373 Followers: 1 Kudos [?]: 7 [0], given: 0 [#permalink] 16 Nov 2006, 14:36 400 for me - maybe OA is wrong, wouldn't be the first time. What is source? Intern Joined: 16 Nov 2006 Posts: 2 Location: Beantown Followers: 0 Kudos [?]: 0 [0], given: 0 [#permalink] 16 Nov 2006, 14:53 Definitely not 800, that would be 2400 in month 3 and 5400 in month 7 400 is right (1600 in month 3 and 3200 in month 7) This question can also be done in well under 2 minutes just by plugging in numbers [#permalink] 16 Nov 2006, 14:53 Similar topics Replies Last post Similar Topics: Exactly one year ago, Ray put his money into a 3 11 Sep 2012, 21:48 14 Michelle deposited a certain sum of money in a savings 10 02 Sep 2012, 19:39 18 At a supermarket, John spent 1/2 of his money on fresh fruit 8 06 Aug 2012, 01:53 6 Joan took out a mortgage from hel local bank. Each monthly 13 20 Apr 2012, 23:54 16 An investor opened a money market account with a single deposit of$60 14 29 Dec 2009, 12:28
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