Level 4 Passport to Advanced Math
1/x + 3/x = 1/2
Dennis is helping Billy assemble his new computer desk. Billy can put the desk together three times as fast as Dennis, and together Billy and Dennis can finish assembling the desk in 2 hours. The equation above represents this situation. Which of the following describes what the expression 3/x represents in this equation?
(A) The fraction of the job that would be completed by Billy in 1 hour.
(B) The fraction of the job that would be completed by Dennis in 1 hour.
© The time, in hours, that it takes Billy to complete one third of the job.
(D) The time, in hours that it takes Billy to assemble the desk by himself.