exam Maths Puzzle Numerical Ability

i dont undersatnd these type of questions rationalize 1/^6-^5 , please right the answers in step by step. thankyou

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Hi,
I need help with this problem: {{{3x^3-4x=1}}. I'm unsure how to factor it because of the cube. I moved the one to the other side and tried to factor it, but found i couldnt b How much water must be evaporated from 38 ounces of a 4% salt solution to make a 5% salt solution?

I have to "let x = something"
and then set up an equation and solve it.