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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