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motikmotik
3 years ago
14

In this line of circles, the ratio of red circles to blue circles is 1:3 How many more circles would need to be added to make th

e ratio of red to blue 3:1
Mathematics
1 answer:
zaharov [31]3 years ago
5 0

Answer:

The number of red circles to be added would be equal to 8 times the original amount of red circles

Step-by-step explanation:

Let

x ----> the number of red circles

y ----> the number of blue circles

Originally

\frac{x}{y}=\frac{1}{3}

y=3x ----> equation A

How many more circles would need to be added to make the ratio of red to blue 3:1

Let

n ----> the  number of additional red circles

\frac{x+n}{y}=\frac{3}{1} ----> equation B

substitute equation A in equation B

\frac{x+n}{3x}=\frac{3}{1}

solve for n

x+n=9x\\n=9x-x\\n=8x

therefore

The number of red circles to be added would be equal to 8 times the original amount of red circles

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2 years ago
Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students
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Answer: A. 85.7

Step-by-step explanation:

Given : Two sections of a class took the same quiz.

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We know that  , \text{Mean}=\dfrac{\text{Sum of observations}}{\text{No. of observations}}

Then , for section A :

\text{Mean score }=\dfrac{\text{Sum of scores in sec A}}{\text{No. of students}}

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Hope this helped!

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brainly.com/question/24265969?referrer=searchResults

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