A work that could be completed in 10 days was completed in 8 days as 5 more men joined at the start of work. What was the total number of men before the 5 men joined?
Answer & explanation
Correct answer: option 3
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,
⇒ M x 10 = (M + 5) x 8
⇒ 5M = 20 + 4M
⇒ M = 20.