exam Maths Puzzle Numerical Ability

simplify completely:

y over x subtract x over y divided by 2 over y subtract 2 over x

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exam Other Question

How do I find the minimum and maximum possible volume for a rectangullar solid with measurements of 16in x 22 in x 18 in. Any help is greatly appreciated. Thank You The directions say "Use product property to simplify the expression".
1.) Radical 240