What are the different ways in which we can classify numbers?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Acourt reporter is transcribing an accident report from germany. the report states that the driver was traveling 80 kilometers per hour. how many miles per hour was the driver traveling?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out