exam Maths Puzzle Numerical Ability

if (3/4-2/3)+(1/2+1/3)is calculated and the answer reduced to simplest terms, what is the denominator of the resulting fraction?

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{1}find the sum of this geometric progression series 16+14+___as far as the 6th term????????{2}find the sum of this arithmetic progression 13.9+___+{-0.5}+{-2.1}+{-3.7} The side of a parallelogram is 24" and the altitude drawn to that side is 8". Find the altitude drawn to the adjacent side if the length of that side is 20".