exam Maths Puzzle Numerical Ability

what is the solution to (x-y)(x+y)

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exam Other Question

x-3 + y+5 =11/6
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2 3 </PRE>

I am having a hard time getting this formatted the right way. The 3 should be under y+5 how many gallons of water in a container that measures 6 feet by 26 inches by 26 inches?