Answer :

Let the number of days absent be x.

The number of days for which he was present at the work be (30 – x), as total days are 30.

According to the question**,**

⇒ (30 – x)150 – 50x = 2100

⇒ 4500 – 150x – 50x = 2100

⇒ 4500 – 2100 = 200x

⇒ 2400 = 200x

⇒ x = 12.

Hence,

Number of days he was absent is 12 days

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