book Maths Puzzle Numerical Ability

Factor this trinomial completly

2a^3 - 52a^2b + 96ab^2

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book Other Question

how many pints of a 40% salt solution must be added to 12 pint of a 20% salt solution to end up with a 32% salt sollution i need 1000 mils of 10% acid solution. i have 5% and 25% available. how much of each do i need to make the 1000 mils?

x=5% mils
y=25% mils
5x+25y=1000 this is as far as i c