Answer:
9 + 10 +x= 21
x=21-19
x=2
add 2 in left hand side to get 21
C is the correct answer I think
38 meters long is the answer
$10.50
10 Tickets would be $105.00
$105.00 - $10.50 = $94.50 so 9 Tickets would be $94.50
$105.00 + $94.50 = $199.50
$205.00 - $199.50 = $5.50 which isn't enough for another ticket.
10 Tickets + 9 Tickets = 19 Tickets.
All of them except for letter Z