book Maths Puzzle Numerical Ability

HELP TO RENAME USING THE LCM LIST COMMON MULTIPLE OF AS THE DENOMINATOR
1.)1/3, 2/9, 1/6
2.)1/2, 3/4, 5/8
3.)1/3,1/5, 3/5
4.)2/3, 5/6, 2/2

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book Other Question

(10a^2bc^4)^-2/(5^-1a^-1b^-5)^2 I am tutoring a student with a prealgebra word type problem. I could not figure out the real way to solve it. Here is the problem: A class took a test with four choices to choose;