A company has 25 employees. One day, 8 letters that did not have names on the envelopes arrived for 8 different employees. The m
1 answer:
1. The missing question here is : "what is the probability that the mail sorter placed each letter correctly"?
2. Name the letters L1, L2, ....L8 (Letter 1, Letter 2.... Letter 8)
3. The first letter has a probability of 1/25 to be placed in the correct mailbox.
Each of the remaining 7 letters have 1/25 probability, and these probabilities are related.
4. So the probability that each letter goes to the proper mailbox is
2. Name the letters L1, L2, ....L8 (Letter 1, Letter 2.... Letter 8)
3. The first letter has a probability of 1/25 to be placed in the correct mailbox.
Each of the remaining 7 letters have 1/25 probability, and these probabilities are related.
4. So the probability that each letter goes to the proper mailbox is
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Answer:
It takes 1 seconds for push-ups and 3 seconds for sit-ups for Mei to do exercise.
Step-by-step explanation:
Given:
Let the time taken for push-ups be 'x'.
Let the time taken for sit-ups be 'y'.
Now Given:
17 push-ups and 6 sit-ups, it takes a total of 35 seconds.
So we can say that;
Also Given:
41 seconds to do 20 push-ups and 7 sit-ups.
so we can say that;
Now Multiplying equation 1 by 7 we get;
Now Multiplying equation 2 by 6 we get;
Now Subtracting equation 3 from equation 4 we get;
Now substituting the value of x in equation 1 we get;
Hence It takes 1 seconds for push-ups and 3 seconds for sit-ups for Mei to do exercise.