book Maths Puzzle Numerical Ability

Can someone out there help me with this problem?

At what rate would a 180-poind person burn calories while bicycling at 12 mi/h? (For a 150 pound person bicycling they burn 410 calories/h.
Thanks,
Sher

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book Other Question

Problem Solving Using Systems of Equations

8x+9y=1030 x=1030-9y/8
1x+1y=120 1(1030-9y/8)+y=120

-1y=-70 or y=70 HOW DID I COME UP WITH 70? If 48 square inches are subtracted from the area of a square table, the result would be equal to twice the perimeter. What is the length of the side of the table?
______ feet long