exam Maths Puzzle Numerical Ability

Any help is appreciated.
Simplify

3sqrt-1/8

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exam Other Question

A merchant has coffee worth $40 a pound that she wishes to mix with 20 pounds of coffee worth $80 a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $40 coffee should be used? Each of the red curves is a transformation of the graph y = 0.5x, shown in black. Write an equation for each red curve.