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.