A work can be completed by X men in 15 days. 10 more men join them after 3 days. The remaining work is now completed in 8 days. What is the value of X?
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 the values in the formula,
⇒ X x 15 = (X x 3) + (X + 10) x 8
⇒ 15X = 3X + 8X + 80
⇒ 15X - 11X = 80
⇒ 4X = 80,
⇒ X = 20.