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Bunuel
If x and y are positive numbers, x is what percent of y?

(1) 3x is 72% of 2y
(2) y = 2x + 1

If x and y are positive numbers, x is what percent of y?

(1) 3x is 72% of 2y
3x = 72% * 2y
x/y = 72% * 2/3 = 48%
x is 48% of y
SUFFICIENT

(2) y = 2x + 1
1 = 2x/y + 1/y
Since y is unknown
NOT SUFFICIENT

IMO A
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Bunuel
If x and y are positive numbers, x is what percent of y?

(1) 3x is 72% of 2y
(2) y = 2x + 1

find x= a/100 * y
#1
3x is 72% of 2y
3x = 72/100 * 2y
or say
12y= 25x
x= 12y/25
so
12y/25 = a/100 * y
a = 48
i.e 48%
sufficient
#2
y = 2x + 1
clearly insufficient
we get
50y-50= a*y
two unknown insufficient
OPTION A
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