A and B cand o a pieces of work in 10 days and 15 days, respectively. They started the work together but B left after sometime and A finished the work in 5 days. After how many days (from the start) did B leave?

Explanation

To solve the problem step by step, we can follow these calculations:

### Step 1: Determine the Work Rates of A and B
- A can complete the work in 10 days, so A's work rate is:
\[ \text{Work rate of A} = \frac{1 \text{ work}}{10 \text{ days}} = 0.1 \text{ work/day} \]
- B can complete the work in 15 days, so B's work rate is:
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