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# Someone deposited money for his daughter monthly. In each

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Manager
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Someone deposited money for his daughter monthly. In each [#permalink]

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15 Nov 2006, 21:56
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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?
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15 Nov 2006, 22:17
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
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15 Nov 2006, 23:09
But OA is 800.....How?

Can u explain?
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16 Nov 2006, 15:36
400 for me - maybe OA is wrong, wouldn't be the first time. What is source?
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16 Nov 2006, 15:53
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
16 Nov 2006, 15:53
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