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      Question

      In a class, the ratio of number of boys to number of

      girls is 9:4. If 5 boys joined the class and 1 girl left the class, then the ratio becomes 7:3. Find the actual number of girls in the class.
      A 76 Correct Answer Incorrect Answer
      B 80 Correct Answer Incorrect Answer
      C 84 Correct Answer Incorrect Answer
      D 88 Correct Answer Incorrect Answer

      Solution

      Let initially the number of boys and girls be 9x and 4x, respectively.
      (9x + 5) : (4x βˆ’ 1) = 7 : 3
      Or, 3(9x + 5) = 7(4x βˆ’ 1)
      Or, 27x + 15 = 28x βˆ’ 7
      Or, x = 22
      Therefore, number of girls = 4 Γ— 22 = 88

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