Question: Twelve men can complete a work in 8 days. Three days after they started the work, 3 more men joined them. In how many days

Twelve men can complete a work in 8 days. Three days after they started the work, 3 more men joined them. In how many days will all of them together complete the remaining work ?
a. 2
b. 4
c. 5
d. 6

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