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Question
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The boys and girls in a school are in the ratio 9 : 5. If the number of girls is 320, then the total strengh of the school is
(a) 840
(b) 896
(c) 920
(d) 576
The boys and girls in a school are in the ratio 9 : 5. If the number of girls is 320, then the total strengh of the school is
(a) 840
(b) 896
(c) 920
(d) 576
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Solution
(b) 896
Suppose that the number of boys in the school is x.
Then, x : 320 = 9 : 5
⇒ 5x = 2880
⇒ x = 576
Hence, total strength of the school = 576 + 320 = 896
Suppose that the number of boys in the school is x.
Then, x : 320 = 9 : 5
⇒ 5x = 2880
⇒ x = 576
Hence, total strength of the school = 576 + 320 = 896
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