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  9. Q59

ibps-rrb-os1 2021 · Question 59 of 173

The average Hindi marks of two sections A and B of class VIII in the annual examination is 75. The average marks of Section A is 78.5 and that of section B is 70. The ratio of the number of students of section A and B is

Average

  1. A8:3
  2. B7:4
  3. C14:5
  4. D10:7Correct
  5. ENone of these

Answer: D. 10:7

Explanation

Let the number of students in section A is x and B is y, then 75 = (78.5 × x + 70 × y)/ (x + y) ⇒ 75x + 75y = 78.5x + 70y ⇒ 5y = 3.5x ⇒ x/y = 5/3.5 ⇒ x/y = 10 : 7

Source: IBPS RRB Scale I Officer 2021 Prelims Previous Year Paper (memory-based compilation, ixamBee) · memory-based

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