book Maths Puzzle Numerical Ability

sloving equations for an example -1.6r+5=-7.8

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book Other Question

This is a tough one.

3y^2+4xy-9x^2=-1

A. Solve for X in terms of Y B. Solve for Y in terms of X an overnight delivery service accepts packages of up to 165 inches in length and girth (distance areound the package) combined. a package has a fixed girth of 53 inches. Determi