There are 40 coins in a tin. It contains $1 coins, $0.50 coins and $0.20 coins. The number of $1 coins is 5 times as many as $0.50 coins. The total value is $33.80. How many $1 coins are there?
There are 40 coins in a tin. It contains $1 coins, $0.50 coins and $0.20 coins. The number of $1 coins is 5 times as many as $0.50 coins. The total value is $33.80. How many $1 coins are there?
