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      Question

      Salaries of M, N and O are in the proportion 4:6:5. Their

      average salary is Rs. 18,000. If M spends 50% of salary, N spends 60%, and O spends 70%, find their average spending.
      A Rs. 12,050 Correct Answer Incorrect Answer
      B Rs. 16,200 Correct Answer Incorrect Answer
      C Rs. 10,920 Correct Answer Incorrect Answer
      D Rs. 11,025 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total salary = 18000 × 3 = Rs. 54,000

      M’s salary = 54000 × (4/15) = Rs. 14,400

      N’s salary = 54000 × (6/15) = Rs. 21,600

      O’s salary = 54000 × (5/15) = Rs. 18,000

      M’s expense = 14400 × 0.5 = Rs. 7,200

      N’s expense = 21600 × 0.6 = Rs. 12,960

      O’s expense = 18000 × 0.7 = Rs. 12,600

      Average expenditure = (7200 + 12960 + 12600) ÷ 3 = Rs. 10,920

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