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Q.

The boys and girls in a school are in the ratio 9: 5. If the number of girls is 320, then what is the total strength of the school?


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a

840

b

896

c

920

d

576 

answer is B.

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Detailed Solution

Given that,
Ratio of boys and girls in a school is 9: 5.
Number of girls is 320.
Let the ratio of boys be 9x, for girls it is 5x.
Strength of girls
⇒5x=320  
⇒x=64  .
Total strength,
⇒9x+5x  
⇒14x  
⇒14×64 ⇒896  
Thus, the total strength of the school will be 896.
Thus, option 2 is correct.
 
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