exam Maths Puzzle Numerical Ability

I need help! Please help
In the period of a year, an investor lost twince as much as he gained. If he originally had $10,000 and now has $8000, what amount did he gain and what did he lose?
Please and Thank You=)

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exam Other Question
Three years ago, a man was eight times as old as his son. In two years, he will be four times as old as the son. Find their present ages.

Thank you. (3x^3y^5m^2)(x^2y)^-2
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x^2y^0y^-4

This problem needs to be simplified, so far I have (9x^4y^10m^4)(x^-4y^2)
Am I anywhere close to the correct answer?