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# GMATPRep

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VP
Joined: 18 May 2008
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GMATPRep  [#permalink]

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09 Sep 2008, 18:56
Please explain also

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Director
Joined: 12 Jul 2008
Posts: 511
Schools: Wharton
Re: GMATPRep  [#permalink]

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09 Sep 2008, 19:00
ritula wrote:
Please explain also

7x + 77y = 350
7(x + 11y) = 350
x + 11y = 60

For the possibilities listed, x = 38, y = 2. x+y = 40
VP
Joined: 17 Jun 2008
Posts: 1279
Re: GMATPRep  [#permalink]

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09 Sep 2008, 19:01
ritula wrote:
Please explain also

let the tota;l number of numbers value 77=q,then with 7=n-q

now we know that 7(n-q)+77(q)=350 => n-q+11q=50
n+10q=50 => q=(n-50) /10 inorder to make q as integer w need multiple of 10 hence IMO C
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Re: GMATPRep  [#permalink]

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09 Sep 2008, 21:07
we need not to do any caluclations.

all terms are either 7 or 77.
so unit digit is always 7.

to make sum 350 then no.of sevens in unit digit must be multiple of 10.

only Answer which satisfies this is 40

C

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Re: GMATPRep &nbs [#permalink] 09 Sep 2008, 21:07
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