Sammy bought 5 tickets.
To find this answer, first subtract 5.50 from 144.25, since that amount was for the overall order, and not each individual ticket. $144.25 - $5.50 = $138.75
Now, to find the number of tickets she bought, divide $138.75 by $27.75. $138.75 รท $27.75 = 5. Thus meaning she bought 5 tickets.
I hope this helps!