A scientist has two solutions, which she has labeled Solution A and Solution B.

Question

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 20% salt and Solution B is 45%salt. She wants to obtain 110 ounces of a mixture that is 40% salt. How many ounces of each solution should she use? 

Answer 1

A + B = 110 A = 110 - B

.2A + .45B = .40(110)

.2(110 - B) + .45B = .40(110)

22 - .2B + .45B = 44

.25B = 22

B = 88 mL

A = 22 mL

You should now plug these back in and check.