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If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and

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If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and [#permalink] New post 04 Apr 2018, 15:09
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Question Stats:

66% (01:32) correct 33% (02:18) wrong based on 12 sessions
If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and y = 2 ⋅ 2 ⋅ 8 ⋅ b, and the values of both x and y lie between 120 and 130 (not including the two), then a – b =

(A) –2
(B) –1
(C) 0
(D) 1
(E) 2
[Reveal] Spoiler: OA

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Re: If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and [#permalink] New post 04 Apr 2018, 18:13
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X= 2.3.7a = 42a so a must be 3 in order to be between 120-130
Y = 2.2.8.b = 32b so b must be 4 in order to be between 120-130
a-b or 3-4 is -1 (B)
Re: If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and   [#permalink] 04 Apr 2018, 18:13
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If a and b are positive integers, and x = 2 ⋅ 3 ⋅ 7 ⋅ a, and

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