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Q.

In a bag number of 25p coins, 20p coins and 10p coins are in the ratio 3 : 7 : 9 and together worth of Rs. 61. Find the number of 20p coins. 

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a

140

b

60

c

90

d

180

answer is B.

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Detailed Solution

5    :   4    :    225  :   20   :   103  :   7     :    9  15   :   28   :    18

15+28+18=61

28⇒28×10020=140

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