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In a class, there are 18 very tall boys. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class?1. 62. 123. 184. 21 |
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Answer» Correct Answer - Option 2 : 12 Given No. of boys who are very tall = 18 Calculation Let the number of boys be x. ⇒ (3/4)x = 18 ⇒ x = 18 × (4/3) = 24. ⇒ If total number of students is y, ⇒ (2/3) y = 24 ⇒ y = 24 x (3/2) = 36. ⇒ Number of girls in the class = (36 - 24) = 12. ∴ The number of girls in the class is 12. |
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