Some ladies can do a piece of work in 12 days. Two times the number of such ladies will do half of that
work in :  Pick one:
A) 6 days B) 4 days C) 12 days D) 3 days E) 8 days

Rationale: expl : let x ladies can do the work in 12 days . more ladies , less days ( indirect ) less work , less days ( direct ) ladies 2 x : x work 1 : ½ 2 x : x , 1 : ½ : : 12 : y : . 2 x * 1 * y = x * ½ * 12 or y = 3 hence the required number of days = 3 answer : d
Answer: D