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If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ?

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If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ? [#permalink]

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09 Apr 2013, 18:54
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Question Stats:

81% (01:39) correct 19% (02:21) wrong based on 107 sessions

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If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

A. -4
B. -2
C. 0
D. 2
E. 4

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Re: If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ? [#permalink]

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09 Apr 2013, 19:00
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Quote:
If 9a - b = 10b + 80 = -12b - 2a, what is the value of 11a + 11b?

This implies 9a - b = 10b + 80, 9a -b = -12b -2a, 10b + 80 = -12b -2a

Manipulating the second equation gives us 9a - b = -12b - 2a ==> 11a + 11b = 0

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Re: If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ? [#permalink]

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09 Apr 2013, 21:37
So it means =

9a - 11b = 80................... (i)
2a + 22b = -80..................(ii)

11a + 11b = 0
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Re: If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ? [#permalink]

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23 Aug 2014, 00:05
Only 0 is multiple of 11, so C

Kudos [?]: 27 [0], given: 41

Re: If 9a-b = 10b+80 = -12b - 2a, what is the value of 11a+11b ?   [#permalink] 23 Aug 2014, 00:05
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