18.
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In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there?
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Answer: Option C
Explanation:
Let the number of 25 p, 10 p and 5 p coins be x, 2x, 3x respectively.
Then, sum of their values = Rs.
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25x
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+
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10 x 2x
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+
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5 x 3x
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= Rs.
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60x
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100
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100
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100
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100
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60x
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= 30
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x =
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30 x 100
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= 50.
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100
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60
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Hence, the number of 5 p coins = (3 x 50) = 150.
