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If y = ax and x = bz, what is y when z = 75?

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Joined: 02 Sep 2009
Posts: 50058
If y = ax and x = bz, what is y when z = 75?  [#permalink]

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New post 13 Apr 2018, 01:35
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (01:53) correct 37% (02:03) wrong based on 70 sessions

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Intern
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B
Joined: 28 Apr 2014
Posts: 48
GMAT 1: 640 Q50 V25
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Re: If y = ax and x = bz, what is y when z = 75?  [#permalink]

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New post 13 Apr 2018, 01:41
IMO D
y=ax=a(bz)=abz=75ab
St 1 b can be calculated and hence 75ab
St2 from y and z, we can calculate the value of ab and hence 75ab
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Re: If y = ax and x = bz, what is y when z = 75?  [#permalink]

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New post 16 Apr 2018, 19:26
IMO B
y=ax and x=bz
So y=abz
We need to find y when z=75 so basically we need to find value of y=75ab

Statement(1)- we can only find the value of b from here which is 1/120 but we need a also.hence insufficient

Statement(2)-From this we can find the value of ab which is 1/25.Hence 75ab will be 3.thus y=3 . Sufficient
Hence B

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Re: If y = ax and x = bz, what is y when z = 75?  [#permalink]

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New post 27 Apr 2018, 23:12
I)y=ax x=bz
y=a/2 no value of y so can't calculate y

II)y=abz
Calculate value of ab when y=2 And z=50
Value of ab is known
Then calculate y when ab and z=75 so
Sufficient

B is answer

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Re: If y = ax and x = bz, what is y when z = 75? &nbs [#permalink] 27 Apr 2018, 23:12
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If y = ax and x = bz, what is y when z = 75?

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