exam Maths Puzzle Numerical Ability

(x/2)(2/3)=4 I can not remember what to do here to save my life. How do I work this problem?

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exam Other Question

x+2y=4 (solve for y) an object is projected upward from the top of a tower. its distance in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. how many seconds to reach ground level?