book Maths Puzzle Numerical Ability

Evaluate this problem and answer in the lowest terms:

9/11 - 3/11 + 7/11

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book Other Question

I am at a lost

6-y/y+4=4/4+y

6- y 4
___ = ____

y+4 4+y

and how do I check the lenghts of the legs of a right triangle are 7 and 24. Find the lenght of the hypotenuse