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The students in three classes are in the ratio 2 : 3 : 5. If 20 students are increased in each class, the ratio changes to 4 ∶ 5 ∶ 7. The total number of students before the increase were1. 102. 903. 1004. None of these |
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Answer» Correct Answer - Option 3 : 100 Given, The students in three classes are in the ratio 2 : 3 : 5 ⇒ Let the students in the class be 2x, 3x and 5x respectively Now,20 students are added to the class and the ratio is 4 ∶ 5 ∶ 7 ∴ (2x + 20)/(3x + 20) = 4/5 ⇒ 10x + 100 = 12x + 80 ⇒ 2x = 20 ⇒ x = 10 ∴ The total number of students before the increase = (2 + 3 + 5) × 10 = 100 ∴ The total number of students before the increase were 100 |
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