Discussion :: Ratio and Proportion
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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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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).
[\( \frac { 120 } { 100 } \) x 7x] and [\( \frac { 110 } { 100 } \)x 8x ]
\( \frac { 42X } {5 }\) and \( \frac { 44X } {5 }\)
The required ratio = [\( \frac { 42X } {5 }\): \( \frac { 44X } {5 }\)] =21.22
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