book Maths Puzzle Numerical Ability

multi-step problem: Karim and his three children enjoy ice skating. the town ice skating rink charges $10.00 for adults and $6.50 for children per visit. the rink also offters a

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a rectagular pond measures 3m by 5m. A concrete walk of uniform width is constructed around the pond. If the walk and pond together cover an area of 39M squared, how wide is the wa Can you help me please?

Solve the equation

-2x/2x+12 = 2x/4x+24 + 2x-1/x+6
thanks so much