Kiran, Leela and Mustafa can build a stage alone in 10, 12 and 15 days. All three start together. Kiran leaves after 2 days, Leela leaves 3 days after that, and Mustafa finishes the stage. The ₹9,000 payment is shared by the work done. What is Mustafa's share?

Explanation

1. 01

   First 2 days, all three: $2 \times \frac{6+5+4}{60} = \frac{30}{60}$.

2. 02

   Next 3 days, Leela + Mustafa: $3 \times \frac{5+4}{60} = \frac{27}{60}$. Total so far $\frac{57}{60}$.

3. 03

   Mustafa does the last $\frac{3}{60}$ in $\frac{3}{4}$ day, so he worked $5\frac{3}{4}$ days.

4. 04

   Mustafa's work = $\frac{23}{4} \times \frac{1}{15} = \frac{23}{60}$; share = $\frac{23}{60} \times 9000 = ₹3{,}450$.