A certain number of workers can do a work in 75 days. If there were 10 workers more it could be finished in 10 days less. How many workers are there? Choices:
A) 65	B) 30	C) 28	D) 24	E) 32

Rationale: "number of workers = 10 * ( 75 - 10 ) / 10 = 65 answer is a"
Answer: A