- 20
- 15
- 10
- 5

Option 1 : 20

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**Given:**

1/B + 1/C = 7/60

1/A + 1/C = 3/20

1/A + 1/B + 1/C = 13/60

**Calculation:**

Solving,

⇒ 1/B = 13/60 - 3/20 = 1/15

Then,

⇒ 1/C = 7/60 - 1/15 = 1/20

**∴ In 20 days, C alone can complete the work.**

** **

**Given:**

1/B + 1/C = 7/60

1/A + 1/C = 3/20

1/A + 1/B + 1/C = 13/60

**Calculation:**

Solving,

1/A + 1/B + 2/C = 7/60 + 3/20 = 16/60

1/A + 1/B + 1/C = 13/60

Subtracting,

1/C = 16/60 - 13/60 = 3/60 = 1/20

**∴ In 20 days, C alone can complete the work.**

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