Question

12 men can complete a work in 9 days, 4 more
men come after 3 days. In how many days the
rest of the work will be completed?​

Answer 1

https://qiita.com/tto16eaola/items/e2b2bfcf61a6b95e104a

https://qiita.com/rmc03ajq2r/items/52460fcd4a452fd49e6f

https://qiita.com/fa7u2sqp45/items/dec8e3704f94b4d79a89

https://qiita.com/xyezgh2s2n/items/e99d35a453ab1f218b08

https://qiita.com/kxfl1oiqtv/items/76164ca52f3b28688564