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Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
But certainly I didn't stole it. Found it in my practice material.

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Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
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QZ wrote:
But certainly I didn't stole it. Found it in my practice material.

Sent from my SM-G615F using GMAT Club Forum mobile app


Sure. Some prep companies just change numbers in official questions and publish them as their own. In such cases it's much better to practice official ones than copies.
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Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
A : 4x + 8y < 160
x + 2y < 40 (dividing by 4)
Also we have,
x + y = 30
Therefore,
y < 40 -30 < 10
If y < 10 , then cost of chemical Y is < 8*10 < 80.

Since x + y = 30, y < 10 -> x > 20.

Therefore cost of material X is
> 4*20 > 80

Hence (1) is sufficient.

(2) is not. So answer is A.

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Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
Hi Bunuel, shouldnt the answer for this one be D ?
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Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
Leo8 wrote:
Chemical X costs $4 per ounce,
Chemical Y costs $8 per ounce.

Given x + y = 30

so cost of the mixture : 4x + 8y = 4x + 8(30-x) = 240 - 4x

statement 1: cost of the mixture is less than 160

240 - 4x < 160 or 4x > 80 or x>20
let's say x = 21 and y = 9

cost of x in the mixture = 21 * 4 = $82
cost of y in the mixture = 9 * 8 = $72

hence : cost of x in the mixture is greater than that of y in the mixture: A


Can someone explain why is option 2 eliminated!
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Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]
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