book Maths Puzzle Numerical Ability

Square root of 18 + Square root of 12.
I dont have a square root button on my computer..sadly, so hopefully you see what im asking.

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book Other Question

If m varies directly as n and inversly as o, and m=20 when n=50 and o=10, find m when n=96 and o=16.
m=____
Thank You. a straight line with the slope 5 contains the points (1,2) and (3,K). Find the value of K.