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Question
Krishnan had 64 coins in his coin box.There were 20-cent coins and 50-cent coins. The total value of all coins was $18.50. How many 20-cent coins and how many 50 cent coins were there?

Dear Sir,
I am really not sure how to divide the coins between the 20 and 50 cents. Kindly advice.
Thanks.

Answer
This is a simple algebra question. Let T be the number of 20 cent coins and F the number of 50 cent coins. Since there are 64 coins you know:

T+F=64

Since the total value is $18.50 you know:

20T + 50F =1850

Now just solve the 1st and plug into the 2nd, so T=64-F and:

20(64-F)+50F=1850

Then solve for F, and hence T

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