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# A class consists of 10 boys and 20 girls. Exactly half of the boys and

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Manager
Joined: 01 Jun 2019
Posts: 72
A class consists of 10 boys and 20 girls. Exactly half of the boys and  [#permalink]

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01 Jun 2020, 20:01
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A class consists of 10 boys and 20 girls. Exactly half of the boys and half of the girls have brown eyes. Determine the probability that a randomly selected student will be a boy or a student with brown eyes.

(A)$$\frac{1}{3}$$

(B)$$\frac{1}{2}$$

(C)$$\frac{1}{5}$$

(D)$$\frac{2}{3}$$

(E)$$\frac{1}{4}$$
Senior Manager
Joined: 18 Dec 2017
Posts: 297
Re: A class consists of 10 boys and 20 girls. Exactly half of the boys and  [#permalink]

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01 Jun 2020, 20:26
Number of students having brown eyes=15
Number of boys having brown eyes= 5
Probability = (10+15-5)÷30
=2/3

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Re: A class consists of 10 boys and 20 girls. Exactly half of the boys and   [#permalink] 01 Jun 2020, 20:26