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26 Jun 2018, 06:24
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
72% (01:33) correct
28%
(01:35)
wrong
based on 295
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a, b, x and y are positive integers. If ay = bx, is 7 a factor of x?
(1) 35 is a factor of a
(2) b when prime factorized will be of the form (5)^s
(1) 35 is a factor of a
(2) b when prime factorized will be of the form (5)^s
quyanhle24
Joined: 27 Nov 2017
Last visit: 03 May 2022
Posts: 11
Own Kudos:
Given Kudos: 14
Location: United States
Schools: Jones '22 (A)
GMAT 1: 730 Q49 V41
GPA: 3.7
26 Jun 2018, 06:38
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Starting with statement (2):
(2) b when prime factorized will be of the form (5)^s
This in insufficient on its own because it provides nothing to help us figure out what X could be.
Statement (1)
(1) 35 is a factor of a
This tells us that that A's prime factorization are at least one 5, and at least one 7.
Insufficient on its own because it tells us nothing about X. B could contain the 7 or X could contain the 7.
Together: It looks like we can solve it since we'd know that B is 5 raised to some power, leaving X with the factorization of 7.
C is our answer.
(2) b when prime factorized will be of the form (5)^s
This in insufficient on its own because it provides nothing to help us figure out what X could be.
Statement (1)
(1) 35 is a factor of a
This tells us that that A's prime factorization are at least one 5, and at least one 7.
Insufficient on its own because it tells us nothing about X. B could contain the 7 or X could contain the 7.
Together: It looks like we can solve it since we'd know that B is 5 raised to some power, leaving X with the factorization of 7.
C is our answer.
26 Jun 2018, 07:06
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quyanhle24
Answer should be e, because even together if a is 35, and b is 5x5 then we would not have an integer, whereas we would with b as 5
