book Maths Puzzle Numerical Ability

I need to know how i wold solve this equation
( 5a^2/6b)(4b/a^3)

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book Other Question

Wanda is 5 years older than Marian. The sum of their ages is 19. Find the age of each. I would like to know how you would find a,b,c, on the special relationships.Like for ex. 8(times square root 3), 24, and 16( times square root 3). How would you find the answer 24. Your help would be greatly appreciated.