(A)

It is easier to approach the mixture problems by forming grids just like 2D set problems.

(1) gives the value of y and hence x can be calculated.

0.35y = 0.1(x+y)

(2) States that there is 35% of acid in the solution. Doesn't help to find the value of x.

Use this website for the basic mixture problems. Actually, jallenmorris pointed me to the purplemath website.

http://www.purplemath.com/modules/mixture.htmThis will guide you through the methodology and you can google for mixture problems for practice (this is how I learnt how to solve these type of problems- though this kind still haunts me

)

HTH.

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