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gmat prep test question number properties????

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Intern
Joined: 26 Jan 2009
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Schools: University of Toronto, Schulich, Western, Queens
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gmat prep test question number properties???? [#permalink]

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06 Apr 2009, 22:32
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can anyone help me with this one
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Re: gmat prep test question number properties???? [#permalink]

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07 Apr 2009, 01:52
a - Number of 7 in the series
b - Number of 77 in the series

7a + 77 b = 350

a + 11b = 50

b= 1 and a = 39 therefor 39 * 7 + 1* 77 = 350 n= 50
b= 2 and a = 28 n= 30
b= 3 and a = 17 n =20

So clearly n =40 is the best choice.
Intern
Joined: 26 Jan 2009
Posts: 23
Schools: University of Toronto, Schulich, Western, Queens
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Kudos [?]: 1 [0], given: 0

Re: gmat prep test question number properties???? [#permalink]

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07 Apr 2009, 06:15
that was easier than i thought it would be....thanks
Re: gmat prep test question number properties????   [#permalink] 07 Apr 2009, 06:15
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