book Maths Puzzle Numerical Ability

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(1) 2x+y=5

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book Other Question

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 will it take to reach ground
level?
If 4aČ-bČ=54, then 4(2a+b)(2a-b)= ?

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