Mara needs to mix some 30% acid solution and some 70% alcohol solution to end up with 20 liters of 54% solution. how many liters of the 70% solution will she need? type in your numerical answer only; do not type any words or letters with your answer.

a = volume of 30% solution in liters

b = volume of 70% solution in liters

0.3a + 0.7b = 0.54(a+b)

a+b = 20

solve the system of

a = 8

b = 12

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

no solution

step-by-step explanation:

there is not enough information in the problem to solve.