Answer:
$20
Step-by-step explanation:
18 ten-dollar bills = 18×10
18×10=$180
He gave 16 of the bills = 16×10
16×10=$160
Now, the question is asking how much money he kept. This refers to the total amount of money, not just how many bills he kept.
(18×10) - (16×10)
180 - 160 = 20
Therefore, Jack kept $20 from selling the tickets.
