A certain number of persons can complete a work in 54 days. If there were 15 persons less, it would take 18 days more for the work to be completed. Initially, the number of persons is:
Answer & explanation
Correct answer: option 1
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 54 = (M - 15) x 72
⇒ M = 60.