book Maths Puzzle Numerical Ability

How do I simplify and divide teh square root of 7 over the square root of 8?

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Concrete is sold by the cubic yard. What is the mass, in kilograms, of one cubic yard of concrete that is five times as dense as water? (1m = 1.094 yd, and 1 m^3 of water has a mas peter wanted to draw a line parallel to the line of a window with equation y=x+2.if the line is supposed to pass through point (2,3).what is the equation of the line desired by peter.