book Maths Puzzle Numerical Ability

(1) 6a^-2 b^3 c^-2/12a^4 b c^-1

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book Other Question

2/3 - 5/6 = 1/x Rosita is four years older than Ruperto. Three times Rosita's age in three years will equal 2 less than 5 times Ruperto's age in three years. How older are they now?