exam Maths Puzzle Numerical Ability

a@b = a+(b+1)

is @ associative (use variable to prove)

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exam Other Question

If 8 elephants eat 8 bananas in 8 minutes then 3 elephant eats 3 bananas in how many minutes? (2x^3-x^2+3x-1)(x+2) i am not able to understand the solution. please clarify step by step