Shana = 10 tickets
She gives 5 to justin
Shana =10-5 =5 tickets
Justin = 5 tickets
Justin gives 3 to his brother
Justin = 5-3 = 2 tickets
Justin's brother = 3
His brother gets 2 more tickets from a friend:
Justins' brother= 3+2=5
Finally:
Shana= 5 tickets
Justin = 2 tickets