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harina [27]
3 years ago
11

If Joan read 75 pages in 4 hours how long will it take her to read 250 pages

Mathematics
2 answers:
galina1969 [7]3 years ago
7 0

Answer:

13 hours and 20 minutes

Step-by-step explanation:

Joan read in 4 hours = 75 pages

She read in 1 hour = \frac{75}{4} pages

                               = 18.75 pages

It will take her to read 250 pages = \frac{250}{18.75}

                                                        = 13.33 hours.

Now we will convert 0.33 hours to minute.

0.33 × 60 = 19.8 minutes  ≈ 20 minutes

It will take her 13 hours and 20 minutes to read 250 pages.

denis23 [38]3 years ago
6 0
75/4=25 pages per hour, so, now we have to divide 250 by 25.

250/25=10

So, it would take Joan 10 hours to read 250 pages. :)
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3 years ago
There are three clubs at Redwood High School: Debate, Student council, and Key club. There are 1000 students in the school. And
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Answer:

The number of students in the key club is 490

Step-by-step explanation:

The given parameters are;

The number of student in the school = 1000

The total number of student in the debate club = 310

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The total number of student who are in debate and student council = 170

The total number of student who are in both debate and the key club = 150

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The number of students who are in all three clubs = 50

Therefore, we have;

Let A represent the number of students in the debate club

Let B represent the number of students in the student council

Let C represent the number of students in the key club

We have;

n(A∪B∪C) = n(A) + n(B) + n(C) -  n(A∩B) - n(B∩C) - n(C∩A) + n(A∩B∩C)

Where;

n(A∪B∪C) = 1000

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n(B) = 650

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n(B∩C) = 180

n(C∩A) = 150

n(A∩B∩C) = 50

Therefore;

n(C) = n(A∪B∪C) - (n(A) + n(B) -  n(A∩B) - n(B∩C) - n(C∩A) + n(A∩B∩C))

Substituting the values gives;

n(C) = 1000 - (310 + 650 -  170 - 180 - 150 + 50) = 490

The number of students in the key club, n(C) = 490.

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