Understanding the Ratio of Red to Blue Marbles

Oct 13, 2025 by miodeya.com 84 views

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Introduction

In this article, we will explore the concept of ratios and proportions in the context of a bag containing 20 marbles of blue and red colour. The ratio of red to blue marbles is given as 3:2, and we will use this information to determine the number of marbles of each colour in the bag.

Understanding the Ratio of Red to Blue Marbles

The ratio of red to blue marbles is given as 3:2. This means that for every 3 red marbles, there are 2 blue marbles. To understand this ratio, let's consider an example. Suppose we have 6 red marbles and 4 blue marbles. In this case, the ratio of red to blue marbles is indeed 3:2, as there are 3 groups of 2 red marbles for every 2 groups of 2 blue marbles.

Calculating the Total Number of Marbles

We are given that the total number of marbles in the bag is 20. Since the ratio of red to blue marbles is 3:2, we can represent the number of red marbles as 3x and the number of blue marbles as 2x, where x is a constant.

Setting Up the Equation

We know that the total number of marbles is 20, so we can set up the equation:

3x + 2x = 20

Combine like terms:

5x = 20

Divide both sides by 5:

x = 4

Calculating the Number of Red and Blue Marbles

Now that we have found the value of x, we can calculate the number of red and blue marbles in the bag.

Number of red marbles = 3x = 3(4) = 12

Number of blue marbles = 2x = 2(4) = 8

Conclusion

In this article, we used the concept of ratios and proportions to determine the number of marbles of each colour in a bag containing 20 marbles of blue and red colour. We found that the number of red marbles is 12 and the number of blue marbles is 8.

Frequently Asked Questions

Q: What is the ratio of red to blue marbles in the bag?

A: The ratio of red to blue marbles is 3:2.

Q: How many marbles of each colour are there in the bag?

A: There are 12 red marbles and 8 blue marbles in the bag.

Q: How did you calculate the number of red and blue marbles?

A: We used the concept of ratios and proportions to set up an equation and solve for the number of marbles of each colour.

References

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Q&A: A Bag Contains 20 Marbles of Blue and Red Colour

Q: What is the ratio of red to blue marbles in the bag?

A: The ratio of red to blue marbles is 3:2.

Q: How many marbles of each colour are there in the bag?

A: There are 12 red marbles and 8 blue marbles in the bag.

Q: How did you calculate the number of red and blue marbles?

A: We used the concept of ratios and proportions to set up an equation and solve for the number of marbles of each colour.

Q: What if the ratio of red to blue marbles is 2:3? How many marbles of each colour would there be in the bag?

A: If the ratio of red to blue marbles is 2:3, we can set up the equation:

2x + 3x = 20

Combine like terms:

5x = 20

Divide both sides by 5:

x = 4

Number of red marbles = 2x = 2(4) = 8

Number of blue marbles = 3x = 3(4) = 12

Q: What if the total number of marbles in the bag is 30? How many marbles of each colour would there be in the bag?

A: If the total number of marbles in the bag is 30, we can set up the equation:

3x + 2x = 30

Combine like terms:

5x = 30

Divide both sides by 5:

x = 6

Number of red marbles = 3x = 3(6) = 18

Number of blue marbles = 2x = 2(6) = 12

Q: What if the ratio of red to blue marbles is 5:3? How many marbles of each colour would there be in the bag?

A: If the ratio of red to blue marbles is 5:3, we can set up the equation:

5x + 3x = 20

Combine like terms:

8x = 20

Divide both sides by 8:

x = 2.5

Number of red marbles = 5x = 5(2.5) = 12.5

Number of blue marbles = 3x = 3(2.5) = 7.5

Q: Can the ratio of red to blue marbles be 1:1?

A: No, the ratio of red to blue marbles cannot be 1:1. If the ratio of red to blue marbles is 1:1, it means that there is an equal number of red and blue marbles. However, the total number of marbles in the bag is 20, which is an even number. Therefore, it is not possible to have an equal number of red and blue marbles.

Q: Can the ratio of red to blue marbles be 4:1?

A: Yes, the ratio of red to blue marbles can be 4:1. If the ratio of red to blue marbles is 4:1, we can set up the equation:

4x + x = 20

Combine like terms:

5x = 20

Divide both sides by 5:

x = 4

Number of red marbles = 4x = 4(4) = 16

Number of blue marbles = x = 4

Q: Can the ratio of red to blue marbles be 1:4?

A: Yes, the ratio of red to blue marbles can be 1:4. If the ratio of red to blue marbles is 1:4, we can set up the equation:

x + 4x = 20

Combine like terms:

5x = 20

Divide both sides by 5:

x = 4

Number of red marbles = x = 4

Number of blue marbles = 4x = 4(4) = 16

Conclusion

In this article, we have answered some common questions related to the ratio of red to blue marbles in a bag containing 20 marbles of blue and red colour. We have also provided examples of different ratios and proportions to help illustrate the concept.

Frequently Asked Questions

Q: What is the ratio of red to blue marbles in the bag?

A: The ratio of red to blue marbles is 3:2.

Q: How many marbles of each colour are there in the bag?

A: There are 12 red marbles and 8 blue marbles in the bag.

Q: How did you calculate the number of red and blue marbles?

A: We used the concept of ratios and proportions to set up an equation and solve for the number of marbles of each colour.