25 men can complete a task in 16 days. Four days after they started working, 5 more men, with equal workmanship, joined them. How many days will be needed by all to complete the remaining task?
Answer & explanation
Correct answer: option 2
Formula to be used here,
\( { M}_{1 } \) x \( { D}_{1 } \) = \( { M}_{2 } \) x \( { D}_{2 } \)
⇒ where, M = No. of Men, D = No. of Days,
⇒ Putting values in the formula,
⇒ 25 x 12 = 30 x \( { D}_{2 } \)
⇒ \( { D}_{2 } \) = 10 days.