What amount of 80% solution and what amount of water is needed to mix in order to obtain two liters of 60% solution of this mixture?

Correct answer:

a =  1.5
b =  0.5

Step-by-step explanation:

0.8 a = 0.60 (a+b)

0.8•a = 0.60•(a+b)

a+b = 2
0.2a-0.6b = 0

a = 3/2 = 1.5
b = 1/2 = 0.5

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