Harvey’s teacher assigns classroom jobs by having students pick job tickets out of a box. There are 21 tickets for Line Leader, 11 tickets for Paper Passer and 18 tickets for Board Cleaner. If Harvey randomly selects a ticket from the box, what is the probability that he will pull out a ticket for Line Leader?

Total number of tickets in the box = 11 + 18 + 21 = 50
There are 21 tickets for line leader

Probability = successful draws / total tickets
Successful draws = 21
Total tickets = 50

Probability = 21 / 50 = 0.42 <<< answer.