186k views
5 votes
Ms. Stewart is a teacher with 28 students. Every school day, Ms. Stewart prints out 2 pages of worksheets for each of them. There are 81 school days left in this school year. Ms. Stewart works out that she will need to print a total of 137 pages in this time. Does that sound about right?

User Jammi
by
4.7k points

2 Answers

5 votes

Answer:

No, that does not sound right.

Ms. Stewart needs to print a total of 4,536 pages in this time!

Explanation:

This situation is an example of ratios and proportions.

What is a ratio?

  • a ratio is a fraction that compares 2 units

What is a proportion?

  • a proportion is when you set two ratios equal to each other to solve for a missing unit

Let's set up the 1st ratio:

"Every school day, Ms. Stwewart prints out 2 pages of worksheets for each [student]"

1 student/2 pages

Let's set up the 2nd ratio:

"Ms. Stewart is a teacher with 28 students"

28 students/x pages

Now, we want to solve how many pages Ms. Stewart prints in a day for 28 students.

Thus, we need to set up a proportion with these 2 ratios.

Make sure the same units are on the numerator and denominator.


(1)/(2) = (28)/(x)

Multiply LHS and RHS by
(1)/(28) to solve for x.


(1)/(2)((1)/(28)) = (28)/(x)((1)/(28))


(1)/(56) = (1)/(x)

∴ Ms. Stewart needs to print 56 worksheets for 1 day.

However, this isn't what the problem is asking us. We want to know how many worksheets Ms. Stewart needs to print for the coming school days.

To find out, we need to make another proportion. We only have 1 ratio so far: 56 worksheets/1 day, so we need to make another one for the coming school days.

Let's set up the 2nd ratio:

"There are 81 school days left in this school year."

y worksheets/ 81 days

Thus, we need to set up a proportion with these 2 ratios.

Make sure the same units are on the numerator and denominator.


(56)/(1) = (y)/(81)

Multiply both sides by 81 to isolate y.


56(81) = (y)/(81)(81)


y = 4,536

∴ Ms. Stewart needs to print 4,536 worksheets for the next 81 days!

User Jordan Smith
by
4.7k points
2 votes

Answer:

No, she would need to print out 4536 pages

Explanation:

2 x 28 x 81 = 4536

User Wu Jie
by
4.9k points