exam Maths Puzzle Numerical Ability

Please show me how to solve the answer to square roots. Thanks

3 square root of 2/3

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exam Other Question

We are struggling with these problems. Thank you
Find the variation constant and an equation of variation where y varies directly as x and y=80 when x=10.

The variation constant is K=_____
The equation of variation is y=_____
Betty and Karen have been hired to paint houses. Working together, they can paint the house in two-thirds the time that it takes Karen working alone. Betty takes 6 hours to paint a