exam Maths Puzzle Numerical Ability

Simplify completely: 3^x(3^(x+4))(5^2x)(25^x)/ (1/3)^x I think the correct answer is 3^(x+4)(5^4x) ??????????

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1) A computer store has 10 copies of a word processing program, 12 copies of a spread sheet program, and 8 copies of a draw program. Three of the word processing, four of the sprea 5x/7-2x/5=6/35 These are fractions 5x, 2x, 6 are all the numerator...