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  1. A work could be completed in 100 days by some workers. However, due to the absence of 10 workers, it was completed in 110 days. The original number of workers was :
    1. 100
    2. 110
    3. 55
    4. 50
Correct Option: B

Let the original number of
workers = x. Then,
x × 100 = (x – 10) × 110
⇒ 10x = 11x – 110
⇒ x = 110
Aliter : Using Rule 23,
Here, D = 100, a = 10,
d = (110 - 100) = 10
Required number

=
a(D + d)
d

=
10(100 + 10)
= 110
10



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