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      Question

      The average age of 16 girls is 35 years. If the age of

      two more girls is added the average decreases by 3.5 years. What is the sum of the age of new girls?
      A 9 Correct Answer Incorrect Answer
      B 15 Correct Answer Incorrect Answer
      C 10 Correct Answer Incorrect Answer
      D 7 Correct Answer Incorrect Answer
      E 13 Correct Answer Incorrect Answer

      Solution

      Total age of 16 girls = 16 Γ— 35 = 560 years Β  If the age of two more girls is added the average decreases by 3.5 years, Β  ∴ Total age of 18 girls = 31.5 Γ— 18 = 567 Now, the sum of the age of new girls = 567 – 560 = 7 years

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