exam Maths Puzzle Numerical Ability

Solve the following equations for x by the square root method
64x2=25

That equation is 64x squared = 25. Please help. I am totally confused!!!

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If R=8, A=16, W=18, what is the formule for A to Z?
A gain dealer sold to one customer 8 bushels of wheat, 2 of corn, and 6 of rye, for $32.60; to another. 2 of wheat, 6 of corn, and 8 of rye, for $36.80; of and to a third, 6 of wh