book Maths Puzzle Numerical Ability

Help...This has me stumped..
How long does it take for an investment to double in value if it is invested at 10% per annum compounded monthly? Compounded continuously??
I got th

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If you mix 8 liters of a 40% solution of acid with some 70% solutions to get a mixture that is a 50% solution. How much of the 70% solution would be used? (5,r) (2,3) slope=2

Question says determine the value of 'r' so that a line through the points with each given coordinate has the given slope. draw a sketch of each situation. P