If 16 coins are 5 rp and 10 rp coins. Amount is equal to 90. Then how many 5rp coins are added to make it 100 rp
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(x+y = 16)*5 = 5x+5y = 80
5x+10y = 90
After subtracting you'll get your answer.
5x+10y = 90
After subtracting you'll get your answer.
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