Question 25
Helen has some \$1, \$2 and \$5 coins. The total value is \$80. All the \$1 coins may be traded in for \$10 coins, resulting in 36 fewer coins. All the \$5 coins may be traded in for \$10 coins, and all the \$2 coins may be traded in for \$5 coins. What is the largest possible number of coins Helen has?