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Question

A bag contains Violet (V), Yellow (Y), Red (R), and Green (G) balls. On counting them, the following results are obtained: 
(i) The sum of Yellow balls and twice the number of Violet balls is 50. 
(ii) The sum of Violet and Green balls is 50. 
(iii) The sum of Yellow and Red balls is 50. 
(iv) The sum of Violet and twice the number of Red balls is 50. 
Which one of the following Pie charts correctly represents the balls in the bag?

The correct answer is

Equations from Ball Counts

Let V, Y, R, and G represent the number of Violet, Yellow, Red, and Green balls, respectively. The problem statements translate to the following equations:

  • (i) \( Y + 2V = 50 \)
  • (ii) \( V + G = 50 \)
  • (iii) \( Y + R = 50 \)
  • (iv) \( V + 2R = 50 \)

Solving the System of Equations

We can solve this system of linear equations step-by-step:

  1. From equation (iii), express Y in terms of R: \( Y = 50 - R \).
  2. Substitute this expression for Y into equation (i): \( (50 - R) + 2V = 50 \).
  3. Simplify the equation: \( -R + 2V = 0 \), which means \( R = 2V \).
  4. Substitute \( R = 2V \) into equation (iv): \( V + 2(2V) = 50 \).
  5. Solve for V: \( V + 4V = 50 \Rightarrow 5V = 50 \Rightarrow V = 10 \).
  6. Calculate R using \( R = 2V \): \( R = 2 \times 10 = 20 \).
  7. Calculate Y using equation (iii): \( Y + 20 = 50 \Rightarrow Y = 30 \).
  8. Calculate G using equation (ii): \( 10 + G = 50 \Rightarrow G = 40 \).

The number of balls are:

  • Violet (V): 10
  • Yellow (Y): 30
  • Red (R): 20
  • Green (G): 40

Calculating Ball Proportions

First, find the total number of balls:

Total balls = \( V + Y + R + G = 10 + 30 + 20 + 40 = 100 \).

Now, calculate the proportion of each color:

  • Violet: \( \frac{10}{100} = 0.1 \) (10%)
  • Yellow: \( \frac{30}{100} = 0.3 \) (30%)
  • Red: \( \frac{20}{100} = 0.2 \) (20%)
  • Green: \( \frac{40}{100} = 0.4 \) (40%)

Matching Proportions to Pie Chart

The correct pie chart must represent these proportions: 10% Violet, 30% Yellow, 20% Red, and 40% Green.

Comparing these proportions to the options, the pie chart provided in Option 1 represents these values accurately.

The image URL for the correct pie chart is:

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Important Questions from Pie Chart

  1. Study the following pie-charts carefully to answer the questions.

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