সব প্রশ্নে ফিরে যান
Math
A man can do a piece of work in 5 days, but with the help of his son, he can do it in 3 days. In what time can the son do it alone?
A) 6.5 days
B) 7 days
C) 7.5 days
সঠিক উত্তর
D) 8 days