exam Maths Puzzle Numerical Ability

twice the lesser of two consecutive intergers is 12 less than 3 times the greater interger find the lesser interger

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exam Other Question

divide 5+ 3j over 2 + j I did the next step and came up with
10 - j5 + j6 -1 over 2^2 - (j^2)^2 I don't know if I did that right and not sure what to do next.
If x + 3 = a, then 2x+ 6 =

(A) a + 3
(B) a + 6
(C) 2a
(D) 2a + 3
(E) 2a + 6