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    Question

    A bag contains 10-paisa, 20-paisa and 50-paisa coins in

    the ratio of 9:7:5, respectively. If the total amount in the bag is Rs. 48, then find 40% of the number of 20-paisa coins in the bag.
    A 20 Correct Answer Incorrect Answer
    B 24 Correct Answer Incorrect Answer
    C 28 Correct Answer Incorrect Answer
    D 27 Correct Answer Incorrect Answer

    Solution

    Let number of 10 paisa, 20 paisa and 50 paisa coins be тАШ9xтАЩ, тАШ7xтАЩ and тАШ5xтАЩ, respectively. ATQ, (0.1 ├Ч 9x) + (0.2 ├Ч 7x) + (0.5 ├Ч 5x) = 48 Or, 0.9x + 1.4x + 2.5x = 48 Or, 4.8x = 48 So, x = 10 So, number of 20 paisa coins = 7x = 70 Therefore, required number of coins = 0.40 ├Ч 70 = 28

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