exam Maths Puzzle Numerical Ability

simplify

3
over
x-5
+1(the 1 is on the outer right)

over
1 is on the outer left
-4
over
x-5

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exam Other Question

please help with this promblem:
(2a^b)(ab^3)(-3a)=
thanks. Is it possible for four consecutive even numbers to have a sum that is 10 more than the sum of the smallest two numbers? If so, tell how many solution(s) there are. If there are no solutions, tell why not.