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    Question

    The ratio of incomes of A and B is 5 : 7. Each of them

    saves Rs 600 per month. The ratio of their expenditures is 3 : 5. What is B's monthly income?
    A Rs.3200 Correct Answer Incorrect Answer
    B Rs.2700 Correct Answer Incorrect Answer
    C Rs.2100 Correct Answer Incorrect Answer
    D Rs.1452 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let incomes of A and B be 5k and 7k respectively. Let their monthly expenditures be 3m and 5m respectively. Savings = Income тИТ Expenditure For A: 5k тИТ 3m = 600 тАж(1) For B: 7k тИТ 5m = 600 тАж(2) From (1): 3m = 5k тИТ 600 From (2): 5m = 7k тИТ 600 m from (2): m = (7k тИТ 600)/5 Substitute in (1): 3 ├Ч (7k тИТ 600)/5 = 5k тИТ 600 (21k тИТ 1800)/5 = 5k тИТ 600 21k тИТ 1800 = 25k тИТ 3000 тИТ4k = тИТ1200 тЖТ k = 300 B's income = 7k = 7 ├Ч 300 = 2100 Answer = Rs 2100┬а

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