a) 15
b) 14
c) 12
d) 10
Answer: d
Explanation: Let initially X number of workers
Using work equivalence method,
X + (X – 1) + (X – 2) + . . . . . + 1 = X × 55% of X
$$\frac{{{\text{X}} \times \left( {{\text{X}} + 1} \right)}}{2} = \frac{{5{\text{X}}}}{{100}}$$
[series is in AP. Sum of AP = {No. of terms (first term + last term)/2}]
X = 10 workers.
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