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 Post subject: GMAT Number Theory (Data Sufficiency)
PostPosted: Mon Oct 19, 2009 3:18 pm 
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Joined: Sun Apr 19, 2009 6:56 pm
Posts: 32
If c is a positive integer between 1 and 9, inclusive, and n = 9,446 + c, then what is the value of c?
(1) n is divisible by 5.
(2) n is divisible by 9.

In the last paragraph, when n is divisible by 5, "c" can be 4 or 9. In the next sentence it states, "if n is divisible by 9, you can add the digits and find what
the nearby multiples of 9 are." Which digits are you adding?


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 Post subject: Re: Test 2, Question 4
PostPosted: Mon Oct 19, 2009 3:21 pm 
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Joined: Mon Apr 06, 2009 5:44 pm
Posts: 81
the sum of the digits of multiples of 9 add up to a multiple of 9:

18 : 8 + 1 = 9
27: 2 + 7 = 9
99: 9 + 9 = 18: 1+ 8 = 9

... etc


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