book Maths Puzzle Numerical Ability

If the doctor wanted to see how much you weighed,what would he use?For US and metric and /spoints

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Find a fraction equivalent to 1/2 such that the product of the numerator and the denominator is 72. I'm really in Geometry and I have a problem about proving right triangles congruent with algebra. The problem is this: On triangle # 1, one leg is y-x and the hypotenuse is 3y+x. O