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The ratio of acid and water in solution A is 2 : 5 and the ratio of acid and water in solution B is 6 : 7. 7 L of A is mixed with 9 L of B.…

3613Medium DSSSB TGT Computer Science 0 replies 2 views

The ratio of acid and water in solution A is 2 : 5 and the ratio of acid and water in solution B is 6 : 7. 7 L of A is mixed with 9 L of B. In 312 mL of the resulting solution, the quantity (in mL) of acid is:

A125
B135
C120
D130

Correct answer: C

Explanation

Acid in A = 7 × 2/7 = 2 L. Acid in B = 9 × 6/13 = 54/13 L. Total acid = 80/13 L in 16 L, i.e. a fraction 5/13. In 312 mL, acid = 312 × 5/13 = 120 mL.

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