A can do a work in 24 days and B can do it in 12 days. In how many days A and B can do the work?
Choose the correct choice:	A) 20 days	B) 10 days	C) 6 days	D) 5 days	E) 8 days
8 daysxplanation:   A's 1day's work = 1/24   B's 1day's work = 1/12   They work together = 1/24 + 1/12 = 3/24 = 24/3= 
<gadget id="calculator">24/3</gadget>
<output>8</output>
8 days   Answer: Option 8 days
<result>E</result>
A can do a work in 24 days and B can do it in 12 days. In how many days A and B can do the work?