80 coins amount to a total of Rs 6 50 These coins are of denominations 10 paise and 5 paise Find the...........

Quantitative Aptitude (CDS) Mixture and Alligation

80 coins amount to a total of Rs 6.50.These coins are of denominations 10 paise and 5 paise.Find the number of 5 paise coins?

total 80 coins
total amount is Rs 6.50
6.50 (100)=650 paise
let 5 paise x number of coins
5(x)+(80-x)10=650
-5x=-150
x=30

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