book Maths Puzzle Numerical Ability

please help!!!

word problem:

How many liters (L) of a 10% silver iodide solution must be mixed with 9 L of a 4% silver iodide solution to get a 6% solution?

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book Other Question

solve -3(x-1) = 12 +6x a)-1 b)0 c) all real numbers d) no solution The difference between 1/4 of a number and 1/6 of the same # is 18. Which equation shows the correct relationship?
1.1/4x-1/6x=18
2.1/4x=1/6x=18
3.1/4x+18=1/6x
4.1/6x-18+1/4x=18
5.1/6x-18=1/4x