Peter having a bag of coins of 25p, 10p and 5p in the ratio of 2 : 3 : 4. if there are Rs. 45 in all, how many 5p coins are there?
Solution: Let the number of 25p, 10p and 5p coins be 2x ,3x, 4x respectively.
Then, sum of their values = Rs(25*2x/100 + 10*3x/100 + 5*4x/100)
= Rs 100x/100.
.'. 100x/100 = 45
=> x = 45.
Hence, the number of 5p coins = 4*45 = 180
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