exam Maths Puzzle Numerical Ability

what is the solution to 5w^5/7=160?

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exam Other Question

a rock falls from a tower that is 176ft high. As it is falling its height is given by the formula h=176-16t^2. how many seconds will it take for the rock to hit the ground(h=0) solve the equation.
1/x+1 + 1/x-1 =2/x^2-1