1.

Two solutions of acid and water containing acid and water in the ratio 2 ∶ 7 and 4 ∶ 5, respectively are mixed in the ratio 2 ∶ 5. What is the ratio of acid and water in the resulting solution?

A. 8 : 13
B. 3 : 7
C. 8 : 17
D. 2 : 1
Answer» B. 3 : 7


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