Correct Answer - Option 4 : 8 months

**Given:**

Initial investments of Pinky and Ravi = 5 : 6

Annual Profits = 2 : 3

Ravi invested the money for = 10 months

**Calculation:**

Suppose Pinky invested Rs. 5x for y months and Q invested 6x for 10 months.

∴ According to the question:

⇒ (5x × y)/(6x × 10) = 2/3

⇒ 5xy/60x = 2/3

⇒ 15y = 120

⇒ y = 120/15

⇒ y = 8 months

**∴ Pinky invested her money for 8 months.**