book Maths Puzzle Numerical Ability

I have a question about 24595 so what is the exact answer For A,b,c are you showing how to do it or is it the answer. I have math problems like that.I can't get it

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square root of 1/16 a lift A can carry 6 more people than a lift B by letting the number of people that B can carry be X state the number of people that A can carry