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# M70-37

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Math Expert
Joined: 02 Sep 2009
Posts: 52294

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04 Sep 2018, 01:36
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Question Stats:

0% (00:00) correct 100% (00:34) wrong based on 9 sessions

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In Woodbridge Elementary school, 27% of the students are redheaded. If there are twice as many boys as there are girls, what percentage of boys are redheaded?

(1) 29% of the girls are redheaded.

(2) The school has 600 students.

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Math Expert
Joined: 02 Sep 2009
Posts: 52294

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04 Sep 2018, 01:36
Official Solution:

We’ll go for LOGICAL because that is our first choice in Data Sufficiency.

In questions with equations and variables, we must check how much information we have and how much we are missing. (1) Knowing two percentages out of three (total number of redheads & redheaded girls) and the ratio between the totals out of which those percentages are taken is enough to find the third percentage. Sufficient! (B), (C) & (E) are eliminated. (2) With the total number of students we can find the number of boys, the number of girls, and the total number of redheaded students, but without any information on the composition of hair color in each gender, we cannot tell how many redheaded boys there are. (D) is eliminated.

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Joined: 08 Dec 2017
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12 Dec 2018, 08:53
can some explain me in equations ?
Intern
Joined: 16 Oct 2018
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19 Jan 2019, 10:54
But the total no of red hair can only be found by the total no of students.
Re: M70-37 &nbs [#permalink] 19 Jan 2019, 10:54
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# M70-37

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