Okay so the first one is 3 dollars each..because if you subtract 9 from 21 you will be left with 12 dollars so if he spent the money on FOUR tickets it would be 3 because 3 times 4 is 12 :)
1 1/3 plus 1 2/3 adds to three.
Answer:
3
Step-by-step explanation:

Hope this helps!