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The average age of all the students of a class is 23 years. The averag
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Bunuel
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The average age of all the students of a class is 23 years. The averag [#permalink] New post  26 Jan 2021, 07:00
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The average age of all the students of a class is 23 years. The average age of boys of the class is 25 years and that of the girls is 20 years. If the number of girls in the class is 30, then find the number of boys in the class.

(A) 30
(B) 35
(C) 40
(D) 45
(E) 50
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meanup
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Re: The average age of all the students of a class is 23 years. The averag [#permalink] New post  26 Jan 2021, 07:46
Quick approach,

Ans D 45
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