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Q: In a bag containing red, green and blue pens, the ratio of red, blue and green pens in the given order was 7:4:9. If the total number of pens in the bag was 320, how many of them were red?
  • A. 119
  • B. 112
  • C. 105
  • D. 126
Correct Answer: Option B - Let the number of red, blue and green pens in the bag be 7x, 4x and 9x According to the question, 7x + 4x + 9x = 320 20x = 320 x = 16 Hence, number of red pens = 7x = 7 × 16 = 112
B. Let the number of red, blue and green pens in the bag be 7x, 4x and 9x According to the question, 7x + 4x + 9x = 320 20x = 320 x = 16 Hence, number of red pens = 7x = 7 × 16 = 112

Explanations:

Let the number of red, blue and green pens in the bag be 7x, 4x and 9x According to the question, 7x + 4x + 9x = 320 20x = 320 x = 16 Hence, number of red pens = 7x = 7 × 16 = 112