There are 80 coins of $5 in the purse. These coins constitute 20% of its total coins. How many coins are there in the purse?
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let total coins are x.
x of 20%=80
x×20/ 100=80
x/5=80
x=80×5
x=400.
x of 20%=80
x×20/ 100=80
x/5=80
x=80×5
x=400.
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