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# If y is an odd number and x3y4=648, y=? 1) y is positive. 2) x is

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Senior SC Moderator
Joined: 14 Nov 2016
Posts: 1285
Location: Malaysia
If y is an odd number and x3y4=648, y=? 1) y is positive. 2) x is [#permalink]

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26 Mar 2017, 16:14
3
00:00

Difficulty:

55% (hard)

Question Stats:

42% (01:05) correct 58% (01:26) wrong based on 38 sessions

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If y is an odd number and $$x^3*y^4=648$$, y=?

1) y is positive.

2) x is an integer.

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Intern
Joined: 24 Sep 2014
Posts: 5
Re: If y is an odd number and x3y4=648, y=? 1) y is positive. 2) x is [#permalink]

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29 Mar 2017, 04:50
prob statement is: y is an odd number, and x^3*y^4=648
648 can be written as 2^3*3^4
s1: y is positive, but since y is not mentioned as an int, we can't know for sure the value of y, not sufficient
s2: x is an int, then y can be negative or positive, since power of y is 4, not sufficient

s1&s2: x is an int and y is positive, then for sure y is an int and y = 3, sufficient
ans: C
Re: If y is an odd number and x3y4=648, y=? 1) y is positive. 2) x is   [#permalink] 29 Mar 2017, 04:50
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