9.
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The ratio of the number of boys and girls in a college is 7 : 8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?
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8 : 9
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17 : 18
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21 : 22
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Cannot be determined
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Answer: Option C
Explanation:
Originally, let the number of boys and girls in the college be 7x and 8x respectively.
Their increased number is (120% of 7x) and (110% of 8x).
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120
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x 7x
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and
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110
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x 8x
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100
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100
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The required ratio =
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42x
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:
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44x
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= 21 : 22.
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5
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5
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