exam Maths Puzzle Numerical Ability

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4/11, 35%, 0.3666666666666

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exam Other Question

For f(x) = 1/x^2 -2x -8, find the interval(s) where f(x) < 0.

possible answers:
(-4,2)
(-2,4)
(2,4)
(2,8)

Pleeze show me. Thank you. An alloy of silver and gold is to be recast with an addition of silver. The alloy consists of 80 oz, of which 10 oz are gold. If the new alloy is to have only 1/5 of gold in 5 oz, how much silver must be added?

___oz