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

simplify this expression. Assume all variables are positive. (thank you !!)

{y^(1/6)}^3 A man goes into a grocery store and buys a grapefruit and a toy ball. A 7% tax is applied to the price of non-food items. If the total bill is $5.15, including $0.18 in tax on the toy ball, what are the prices of the grapefruit and the ball?