book Maths Puzzle Numerical Ability

I have a problem that says to simplify. I can get as far as the square root of 68. The correct answer is 2 sqaure roots of 17. Can you tell me the steps please to get to that point?

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i could really use your help in this one! the total of eight times a number and fifteen is thirty-one. find the number. thanks I would like to know if this cite is free,It asked for a registration number& pass word.I was not sure if I could be a member.


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