exam Maths Puzzle Numerical Ability

insert one set of parentheses in the expression 2n-3+4n+6n+1 so that it is equivalent to 12n-5.

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exam Other Question

fill in the missing....
x to the 3rd + 216 = ( ) (x to the 2nd - 6x + 36) how do i find the new amount of this number increase 14 by 45%