1.       In the 2012 Summer Olympics in London, the U.S. team won

8 more gold medals than the Chinese team. If the total number of gold medals won by both teams was 84, find the number of gold medals won by each team


2.       The difference of three times a number and 1 is the same as twice the number. Find the number.


3.      A computer science major at a local university has a part-time job working on computers for his clients. He charges $20 to come to your home or office and then $25 per hour. During one month he visited 10 homes or offices and his total income was $575. How many hours did he spend working on computers?