Mathematics, 09.08.2019 03:10 lucy143

Amanda can proofread 17 reports in an hour, while sally can proofread 28 reports in an hour. if they have 420 reports to proofread, how much time will it take between the two of them?

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Answer from: pado4776

9 hours and 20 minutes.

Step-by-step explanation:

In one hour, Amanda can proofread 17 reports.

In one hour, Sally can proofread 28 reports.

That means together, they can proofread 45 reports in one hour.

So we need to divide the total amount of reports by how much they can read in an hour:

420/45 = 28/3 = 9 1/3

The time it takes between the two of them is 9 hours and 20 minutes.

Answer from: adamflex

$9.33\ hours$ or $9\ hours\ and\ 20\ minutes$ [/tex]

Step-by-step explanation:

We know that Amanda can proofread 17 reports in an hour, while Sally can proofread 28 reports in an hour, then the number of reports they can proofread in an hour (together) is:

$17\ \frac{reports}{hour}+28\ \frac{reports}{hour}=45\ \frac{reports}{hour}$

So, together, they can proofread a total of 45 reports per hour.

Since they have 420 reports to proofread, we need to make the following division in order to calculate how much time will it take between the two of them to proofread 420 reports:

$time=\frac{420\ reports}{45\ \frac{reports}{hour}}\\\\time=9.33\ hours$ or $9\ hours\ and\ 20\ minutes$

Answer from: Quest

a) one student is chosen from classroom a, then a student is chosen from classroom b.

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b. this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes. this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes. this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes. this makes them dependent events.

Answer from: Quest

whose power in the senate is equal to the power of the speaker of the house?

step-by-step explanation:

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Amanda can proofread 17 reports in an hour, while sally can proofread 28 reports in an hour. if they...