book Maths Puzzle Numerical Ability

Solve for x in these equations.Verify the solutions.


1/2x=12

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book Other Question

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
-(49/81)^1/2=?
-(216/125)^2/3

How do you do it?