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Serggg [28]
3 years ago
13

I don’t know if it’s wrong or not

Mathematics
1 answer:
faltersainse [42]3 years ago
5 0
I actually think that it is 50
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sarah can complete a project in 90 minutes and her sister betty can complete it in 120 minutes if they both work on the project
alukav5142 [94]

Answer:

It will take them approximately 51.43 minutes to complete the project together

Step-by-step explanation:

This is what is called a "shared job" problem.

The best way to work on them is to start by finding the "portion" of the job done by each of the people in the unit of time.

So, for example, Sarah completes the project in 90 minutes, so in the unit of time (that is 1 minute) she completed 1/90 of the total project

Betty completes the project in 120 minutes, so in the unit of time (1 minute) she completes 1/120 of the total project.

We don't know how long it would take for them to complete the project when working together, so we call that time "x" (our unknown).

Now, when they work together completing the entire job in x minutes, in the unit of time they would have done 1/x of the total project.

In the unite of time, the fraction of the job done together (1/x) should equal the fraction of the job done by Sarah (1/90) plus the fraction of the job done by Betty. This in mathematical form becomes:

\frac{1}{x} =\frac{1}{90} +\frac{1}{120}\\\frac{1}{x} =\frac{4}{360} +\frac{3}{360}\\\frac{1}{x} =\frac{7}{360} \\x=\frac{360}{7} \\x=51.43\,\,min

So it will take them approximately 51.43 minutes to complete the project together.

8 0
3 years ago
Simplify the expressions:
miv72 [106K]

Answer:

1. -9w-15

2. 15w+13

3. -23

6 0
2 years ago
Karel the Dog is instructed to move forward three spaces. Then, if Karel is standing on a ball, Karel will turn right and move f
Klio2033 [76]

Complete Question

The diagram for the question is shown on the first uploaded image

Answer:

The final  position of  Karel is shown on the second uploaded image

Step-by-step explanation:

On the diagram the dot represents steps to be taken by Karel

Now after Karel the Dog has moved forward three spaces, Karel will be standing on a ball, so Karel will turn right  move forward two spaces

So the final position of  Karel is shown on the second uploaded image

5 0
3 years ago
A student has passed 70 percent of the 20 quizzes he has written so far successfully. If this student takes 60 quizzes during th
Ne4ueva [31]
I think the answer is52.4
4 0
3 years ago
What is the answer to 186,000 miles per second rounded to the nearest thousand miles per second.
vitfil [10]
I didn't round by the answer would be 115.575042 miles per second.
3 0
3 years ago
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