exam Maths Puzzle Numerical Ability

two numbers equal 92 the difference between the two numbers is 21

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exam Other Question

Which of the following numbers is not the sum of three
consecutive integers? I am stumped on these two problems. I am not sure how to solve them.

simplify..

sqrt 7 x ^ 2
my answer for this is... x sqrt 7x

3 sqrt 486
can this one even be simplified?