John and Mary each have a number of widgets. Mary said to John, "If you give me one widget, I'll have twice as many as you, but if I give you one widget, we'll each have the same number." How many widgets did each one have?
Answer:
Mary had 7 and John had 5 ....... If giving one widget to John will make their numbers equal, Mary must have two more widgets than John. If x = the number of John's widgets, then x + 2 = the number of Mary's widgets ........... (x + 2) + 1 = 2(x - 1)
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