Jack and Serena can write a lab report together in $6$ hours. If all people work at the same rate, how many hours would it take to write a lab report if Kay joins Jack and Serena?

  4 hours

Step-by-step explanation:

If all work at the same rate, the time required is inversely proportional to the number of people on task. If the number of writers goes from 2 to 3 (is multiplied by 3/2), the time required will be 2/3 of that for 2 people:

  (2/3)(6 hours) = 4 hours

If Kay joins Jack and Serena, the lab report can be done in 4 hours.

x divided by 8=y

step-by-step explanation:

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.