Question

a a man can do a job in 15 days his father takes 20 days and his son finish it in 25 days how long will they take to complete the job if they all work together ​

Answer 1

Hello ❤ ❤

A man can do a job in = 15 days = 1/15

His father can do a job in = 20 days = 1/20

his son = 25 days = 1/25

Together they all work

1/15 + 1/20 + 1/25

= LCM : 300

1/15= 20/300

1/20= 15/300

1/25= 12/300

➡ 47 /300

Hope it's helpful