Question

Marie mixes 16 liters of 18% acid solution with a 27% acid solution which results in 21% acid solution. let x represent the number of liters of 27% solution used. which equation can be used to find the number of liters of 27% acid solution in the mixture?
A. 2.88+0.21x=0.27(x+16)

B. 2.88+0.27x=0.21(x+16)

C. 4.32+0.21x=0.27(x+16)

D. 3.36+0.27x=0.18(x+16)

Answer 1

Okay, because 18% of 16 is 2.88, we can cross off C. and D. as an option.

Now, because it is a 27% acid solution of an unknown amount, B. is not correct because it says 0.21x, rather than 0.27x. Knowing this, we can safely say that The answer is Option A