1. Stating the problem: We know 3 lambs finish eating the grass in 5 days. We want to find how many days 2 lambs will take to finish the same grass. 2. Understand that the work done (eating all the grass) is the same. If 3 lambs take 5 days, the total work is $3 \times 5 = 15$ lamb-days. 3. Since the total work is constant, for 2 lambs, let the number of days be $x$. Then total work is $2 \times x = 15$ lamb-days. 4. Solve for $x$: $$2x = 15$$ $$x = \frac{15}{2} = 7.5$$ days. 5. So, 2 lambs will take 7.5 days to finish eating the grass. Final answer: **7.5 days**.