Answer:
1 ticket = $3
$50 = around 16 tickets ($2 remaining)
3 tickets = $5
1 ticket = $1.33
$50 = around 37 tickets (around $0.80 remaining)
5 tickets = $8
1 ticket = $1.60
$50 = around 31 tickets ($0.40 remaining)
10 tickets = $10
1 ticket = $1
$50 = 50 tickets exact (no change)
Ans: You should buy 10 tickets.
