sandy wrote:

Jane has a 40-ounce mixture of apple juice and seltzer that is 30% apple juice. If she pours 10 more ounces of apple juice into the mixture, what percent of the mixture will be seltzer?

(A) 33%

(B) 44%

(C) 50%

(D) 56%

(E) 67%

Given 40 ounce mix = Apple juice + seltzer

Now 40 ounces contain 30% apple juice i.e. 12 ounce and seltzer will be 28 ounces.

We are told that 10 more ounces of apple juice ( 100% ) is added to mixture, then total mixture will be 50 ounces.

We want seltzer percentage in the total juice and since only 100% apple juice is added, seltzer concentration doesn't get affected.

So. 28 / 50 => 0.56

D.