book Maths Puzzle Numerical Ability

four times the quantity of a number decreased by one is the same as two more than the same number.find the number?
Please help I always have problems with these.
Thanks!
Tina

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book Other Question

graph: y = tan 1/2theta 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?