In California today,

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In California today,

by Crystal W » Mon May 30, 2016 6:49 pm
In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.

A.In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.
B.Of the Californians under the age of eighteen, today more than 43 percent of them are Hispanic, compared with a decade ago, when it was about 35 percent.
C.Today, more than 43 percent of Californians under the age of eighteen are Hispanic, compared with about 35 percent a decade ago.
D.Today, compared to a decade ago, Californians who are Hispanics under the age of eighteen account for more than 43 percent, whereas it was about 35 percent.
E.Today, Hispanics under the age of eighteen in California account for more than 43 percent, unlike a decade ago, when it was about 35 percent.

The OA is C. I am confused, in Gmat, compare to is incorrect and compare with is correct. Is that correct? Also, I find an explanation said that in choice B, Of the Californians and 43 percent of them are repeated,but I don't think so. I believe because the sentence refers Californians first and then use them to refer. Am I correct?

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by OptimusPrep » Mon May 30, 2016 7:34 pm
Crystal W wrote:In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.

A.In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.
B.Of the Californians under the age of eighteen, today more than 43 percent of them are Hispanic, compared with a decade ago, when it was about 35 percent.
C.Today, more than 43 percent of Californians under the age of eighteen are Hispanic, compared with about 35 percent a decade ago.
D.Today, compared to a decade ago, Californians who are Hispanics under the age of eighteen account for more than 43 percent, whereas it was about 35 percent.
E.Today, Hispanics under the age of eighteen in California account for more than 43 percent, unlike a decade ago, when it was about 35 percent.

The OA is C. I am confused, in Gmat, compare to is incorrect and compare with is correct. Is that correct? Also, I find an explanation said that in choice B, Of the Californians and 43 percent of them are repeated,but I don't think so. I believe because the sentence refers Californians first and then use them to refer. Am I correct?
Compared to is used to compare dissimilar things: Cars and bikes
Compared with is used to compare similar things: Cars and cars.

You should not eliminate an answer choice directly just by thinking that this would never be correct on the GMAT.
Regarding answer choice B, a decade is compared with 43% people. Hence incorrect.

Hope this helps.