If A and B together can complete a job in 15 days and B alone can complete it in 20 days, in how many days can A alone complete the job?

🧠 Explanation:

If A and B complete a job in 15 days and B alone in 20 days, A alone completes it in 60 days. “Complete” is a verb; “days” is a noun. Calculation involves work-rate methods: 1/A + 1/B = 1/15 → A = 1/60. Such problems strengthen arithmetic, logic, and problem-solving skills.