This is easy. You all need to do this:
100÷2 it equals 50.
You need to subtract one 50 from either Caroline/Mohamed(Take Caroline's for example)
Caroline = 50-16=34.
Then you add 16 to 50(Mohamed's)
50+16=66
Therefore, Caroline sold 34 tickets, however, Mohamed sold 66 tickets.
To prove: add 66+34
66+34=100
