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A bag contains red and blue balls. The ratio of the red and blue balls is 8 ∶ 11. If the number of blue balls is 550, then find the number of red balls in the bag.
1. 500
2. 400
3. 450
4. 525

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Correct Answer - Option 2 : 400

Given:

The ratio of red and blue balls is 8 ∶ 11

The number of blue balls is 550

Calculation:

Let the number of red balls be 8x,

Then the number of blue will be 11x,

According to the question,

⇒ 11x = 550

⇒ x = 550/11

⇒ x = 50

Number of the red balls,

⇒ 8x = 8 × 50

⇒ 400

∴ The number of red balls is 400

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