C61

"Alright, I'll help you do it." I nodded and asked him, "Borrowing ten years of lifespan, your wife can only live one year. How many years do you plan to lend her?"

The Ma Hai replied without hesitation: "I'm almost 30 this year. With my physique, I should be able to live to 80. I'll lend it to her for 50 years."

Fifty years would only be enough for his wife and five years