You are competing in a mountain bike race. Your average speed is 10 mi/h. If the racecourse is 65 miles long, how many minutes will it take you to finish the race?
When we add 55 to a number x and divide the total by 4 the result is three times the original number. Find x.
7x + 4y = 17
3x - 2y = -15
using the elimination method.
Dennis is 10 years older than Toby, and Cindy is 5 years younger than Toby. If the sum of their ages is 50, How old is Toby? How old is Cindy? How old is Dennis?