Question

A group of men decided to do the job in 4 days . but since 20 men dropped out every day , the job completed at end if 7th day day . how many men were there at thr beginning

Answer 1

Let X be the initial number of men then,
According to the question,
4X = X + (X-20) + (X-40) + (X-60) + (X-80) + (X-100) + (X-120)
==> 4X = 7X-420
==> 3X = 420
==> X = 420/3
==> X = 140 men.

Answer 2

Answer:

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Step-by-step explanation:

Let X be the initial number of men then,

According to the question,

4X = X + (X - 20) + (X - 40) + (X - 60) + (X - 80) + (X - 100) + (X - 120)

⇒ 4X = 7X - 420

⇒ 3X = 420

⇒ X = 420/3

⇒ X = 140 men