Answer:
The answer is 3 1/2.
Step-by-step explanation:
-There are 2 simple ways to do this.
-The first is just subtracting 3/4 and 1/4 which equals 2/4 or 1/2.
-The second way is to turn it into an improper fraction.
-(5*4)+3=23 and (2*4)+1=9.
-23/4-9/4=14/4
-14/4=3 1/2
The probability of the black marble will be 35.7% because 100/(9+5) is 7.14 and you multiply that by 5 to get 35.7%.
Answer:
<em>Worker B needs 9 days to finish the rest of the work</em>
Step-by-step explanation:
<u>Proportions</u>
Worker A finishes a project on his own in 12 days and worker B does the same in 16 days.
Worker A does 1/12 of the project in one day and worker B does 1/16 of the project in one day. When working together, they do

After 3 days they have completed:

parts of the project, this means it still remains:

parts of the project and it is done by B alone. Since B does
per day, he now takes

days to complete the project.
Worker B needs 9 days to finish the rest of the work
Prime factorization of 620:
620
2 310
2 155
5 31
31 1