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Question

What coins?
Latha bought a pencil and a pen for seven and a half rupees. She gave Rs 10/−. The shopkeeper gave back the money in half and quarter rupees. What are the coins she got?

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Solution

Cost of a pen and a pencil = Rs 712

Total money given to the shopkeeper = Rs 10

Total money returned to Latha by the shopkeeper = Rs 10 − Rs 712
=10-7-12=3-12=Rs 212

We know that,
1 quarter rupee = 25 paise
1 half rupee = 50 paise

Now, the shopkeeper can return Rs 212 in the following ways :
a) 1 half rupee coin and 8 quarter rupee coins

b) 4 half rupee coins and 2 quarter rupee coins

c) 2 half rupee coins and 6 quarter rupee coins

d) 3 half rupee coins and 4 quarter rupee coins

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