Karen’s company needed to reduce expenses. Her salary was cut by 10%. Later, her company decided to give her a raise. By what percent must her pay be raised to bring it back to the original amount?
A bowling alley offers six free games to first time customers. Each game after that costs $0.75, and after every four games, you get a free game. How many games could you play for $3.00 on your first visit to the bowling alley?
Ms. Benson is rewarding her students for doing well on a test. She hands out 50 pieces of candy, one by one, and starts over in the same order after every student gets one piece. Each student takes a piece of candy, in turn, until the plate is empty. Alex gets the first piece, and he also gets the next-to-last piece. How many students could be in the class for this to be possible, if the minimum class size in the school is 20 students?