exam Maths Puzzle Numerical Ability

Simplify
[x^(3/4)*y^(1/3)]^(2/3)

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exam Other Question

3x-4y=7
2x-y=3

then
3x-4y=7
-8x+4y=-12

adding

-5x=-5 then x=1 then 3-4y=7 then 4y=-4 then y=-1
Solution: x=1,y=-1 Assume that y varies directly as x. If y =3.2 when x=0.2, find y when x =1.6