Question

Wayne has 20 bills. The denominations are $2, $5 and $10. The number of $2 bills and $10 bills is the same. The total value of these bills is $110. How many bills of each denomination does he have?
If there are x $2 and $10 bills, then the rest (20-2x) are $5 bills. So,
2x + 5(20-2x) + 10x = 110
now finish it off

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