A,B and C can do a piece ofvwork in 15 , 12 , 20 days respectively. They started the work together, but C left after 2 days. In how many days will the remaining work be completed by A and B ?
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Answers
Step-by-step explanation:
United States Department of Agriculture food pyramid (click to enlarge)
A healthy diet or balanced diet is a diet (what you eat) that contains the right amounts of all the food groups. It includes fruit, vegetables, grains, dairy products, and protein. It does not include too much or too little of any kind of food.[1] Eating wrong amounts of a food group, whether it be too much or too little, is called an "unhealthy diet" or an "imbalanced diet". A healthy diet is one that includes more foods that come from plants and fewer convenience foods.[2]
Answer:4 days
Step-by-step explanation:
A, B, and C can do a piece of work in 12, 15 and 20 days, respectively. They started work together but C left after 2 days. In how many days will the remaining work be completed by A and B?
A does 1/12th of the work in a day.
B does 1/15th of the work in a day.
C does 1/20th of the work in a day.
So in two days that the three work together and they completed
(2/12) +(2/15) + (2/20) = (10/60) + (8/60) + (6/60) or (24/60) or 2/5th of the work. So what remains to be done is 3/5th of the work.
A and B together do (1/12) +(1/15) = (5/60) + (4/60) = 9/60 or 3/20th of the work in a day. So the two working together will take (3/5)/(3/20) = (3*20/(5*3) = 4 days.
A and B will complete the work in 4 days after C had left them.