10/15 Bell Ringer

What is 1/2 + 1/4?

• 6/9
• 4/5
• 2/6
• 3/4

What is 5/6 - 1/3

• 4/3
• 4/6
• 2/6
• 1/2

What is 4/5 * 1/2?

• 4/11
• 2/5
• 2/3
• 5/6

What is 2/7 ÷ 3/4? 

• 6/21
• 4/5
• 5/11
• 8/21

At a community swimming pool there are 2 managers, 8 lifeguards, 3 concession stand clerks, and 2 maintenance people.  If a person is selected at random, find the probability that the person is either a lifeguard or a manager.

• 2/3
• 8/15
• 2/15
• not enough information