a) 240
b) 280
c) 140
d) 150
Answer: c
Explanation: Let X be the initial number of men -:
4X = X + (X – 20) + (X – 40) + (X – 60) + (X – 80) + (X – 100) + (X – 120)
⇒ 4X = 7X – 420
⇒ 3X = 420
⇒ X = $$\frac{{420}}{3}$$
⇒ X = 140 men
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