**Concept: The question tests on the application in Mixture & Average problems**

**Solution:**

Average Concentration = (C1Q1 + C2Q2) / (Q1 + Q2)

Let the quantity be x.

10 = (8 * 5 + 15x) / (5 + x)

50 + 10x = 40 + 15x

5x = 10

x = 2**Option C**

Modified on: Tue, 12 Oct, 2021 at 12:41 PM

**Concept: The question tests on the application in Mixture & Average problems**

**Solution:**

Average Concentration = (C1Q1 + C2Q2) / (Q1 + Q2)

Let the quantity be x.

10 = (8 * 5 + 15x) / (5 + x)

50 + 10x = 40 + 15x

5x = 10

x = 2**Option C**

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