book Maths Puzzle Numerical Ability

please help me find 4 consecutive numbers that total 80

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book Other Question

If the stock's price subsequently declined to $27, what is (a) the percentage decline in the value of stock, and (b) the percentage loss the investor would realize? Why are these hi. i need to know how to factor this equation:

12x^3-23x^2-3x+2

i know that the answer is:

(x-2)(3x+1)(4x-1),

but i don't know how to get this result. please give me