A, B and C can do a work in 15,20,45 days respectively. In how many days they can complete the work together.
Answers:
A) 5.2 days B) 9.2 days C) 8.2 days D) 6.2 days E) 7.2 days
LCM=180   No of days= [180/ (180/15 + 180/20 + 180/45)   = [180/ (12+9+4)]   = [180/25= 
<gadget id="calculator">180/25</gadget>
<output>36/5 = around 7.2</output>
7.2 days   ANSW7.2 daysR:7.2 days
<result>E</result>
A, B and C can do a work in 15,20,45 days respectively. In how many days they can complete the work together.