10 men working 12 hours daily finish a work in 24 days. In how many days will they finish 1/4th of the work working 8 hours daily? Pick:
A) 9 days B) 10 days C) 11 days D) 12 days E) 18 days

Rationale: the number of days needed to finish 1 / 4 of the work = 1 / 4 * 12 / 8 * 24 = 9 days . answer : a
Answer: A