DeeptiM wrote:

If x and y are greater than 0, is x=1?

1) x/y=1

2) xy=1

ST 1x/y=1 and this means x=y so x and y can be 1 , 2, 3 , 4 , .......

EX : 5/5=1 4/4=1 1000/1000=1

NOT sufficient

ST2xy=1 and means x=1/y so x can be 1/5 so y = 5

EX" 1/5 * 5 = 1

also not sufficient

ST1 & ST2x=y and xy=1

you can simply find that xx=1 this means x^2 = 1 so x= +1 or x= -1

and because y and x must be larger than 0 so x must be +1

sufficient

the answer is C _________________

How can i lose my faith in life's fairness when i know that the dreams of those who sleep on the feathers are not more beautiful than the dreams of those who sleep on the ground? - Jubran Khaleel Jubran