book Maths Puzzle Numerical Ability

I'm having difficulty finding the LCD for rational expressions. For example, how do I convert 4b/75ab, 6/105ab^2 to equivalent rational expressions with the lowest common denominat

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I need this immediately for my H.W : The total surfac area of a cone is 616 sq cm.Its slant height i.e. length is equal to three times the radius of the base.Find its radius and slant height.

Please please please send the answer fast... Can you help me write this fraction as a percent?

1 1/5

Thank you,
Sher