Gabrielles age is three times Mikes age. The sum of their age is 88 what is Mikes age?

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.