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

Question

(1) x = 1/2 when z = 60.
(2) y = 2 when z = 50.

NiharikaR · Answer

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

Namk1993 · Answer

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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push12345 · Answer

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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