A certain number of workers can do a work in 65 days. If there were 10 workers more it could be finished in 10 days less. How many workers are there?	Options:
A) 55
B) 30
C) 28
D) 24
E) 32

Rationale: "number of workers = 10 * ( 65 - 10 ) / 10 = 55 answer is a"
Answer: A