Math Riddles

mathsinsane (medium)

Question: can you make an equation by using only the no.-4,4,4,4 whose answer will be 20.

Question: Bobby's teacher gave him a math quiz. Every time he got an answer right, points would be taken away, so whoever had the most points, got the most questions wrong. Bobby's score was the highest, yet he still got the most questions correct out of the class. How is this possible?

Half his Age (medium)

Question: When Tommy was 10 years old his sister Suzy was half his age. Now that Tommy is 50 years old how old is his sister Suzy?

Room (medium)

Question: You need a room for your group. Each person needs 5 square feet of space. You have 25 people in your group, what is the smallest room you can use?

Question: If 2=8, 3=27, 4=64, and 6=216, what does 9 equal?