Hunter gave his sister $3. He earned $12. Then he paid $6 for lunch. Now Hunter has $18. How much money did hunter have to start with?

Mark downloaded 8 new songs on Tuesday. On Thursday he downloaded 4 times as many. He now has 45 songs. How many songs did he have originally?

18 + 12 + 6 + 3 = ?

45 - 8 - (4 * 8) = ?