book Maths Puzzle Numerical Ability

3x + 7y = 1
x + 2y = 1

A) solution = (4,9) B) solution = (5,-2)
C) solution = (1,1/2) D) solution = (1/3 , 1/7)</PRE>

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Here's the question that I have:Mary ha 200 knitted quares. Sue has 5000 knitted squares. Mary makes 20 knitted squares per hour. sue makes 15 knitted squares per hour. Mary an What are the properties of real numbers