book Maths Puzzle Numerical Ability

Equations with variables
3/2y - y = 4 + 1/2y

Do not know where to begin. I believe I would start by simplifying first portion of problem. Would I subtract 3/2y from 1/1y? Clueless.

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book Other Question

The instructor has learned that for the 30 students in her afternoon class, the ratio of student who do not own a computer to those who do is 2 to 1. How many students in the class own their own computer? Jeff leaves his house on his bicycle at 8:30 A.M. and averages 5 miles per hour. His wife, Joan, leaves at 9:00 A.M. following the same path and averaging 8 miles per hour. At what time will Joan catch up with Jeff?