A is 50% as efficient as B. C does half the work done by A & B together. If C alone does the work in 40 days, then A, B and C together can do the work in how many days?  Choose the correct choice:	A) 11 1/3 days	B) 13 1/3 days	C) 12 1/3 days	D) 15 1/3 days	E) 16 1/3 days
A’s one day’s work : B’s one days work = 150 : 100 = 3 : 2.   Let A’s &amp; B’s one day’s work be 3X and 2X days respectively.   Then C’s one day’s work = 5X/2   = &gt; 5X/2 = 1/40   = &gt; X = ((1/40) x (2/5)) = 1/100   A’s one day’s work = 3/100   B’s one day’s work = 1/50   C’s one day’s work = 1/40   Thus, A, B and C can do the work in 13 1/3 days.   ANSWER:13 1/3 days
<result>B</result>
A is 50% as efficient as B. C does half the work done by A & B together. If C alone does the work in 40 days, then A, B and C together can do the work in how many days?