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Q: The ratio of the number of boys in a school to the total number of boys and girls in that school is 7:17. If the number of boys in that school is 1099, then how many girls are there in that school?
  • A. 1560
  • B. 1580
  • C. 1550
  • D. 1570
Correct Answer: Option D - Let the number of boys = 7x and number of boys and girls = 17x According to the question, 7x = 1099 x = 157 Total number of boys and girls = 17 × x = 17 × 157 = 2669 Hence The number of girls = 2669 – 1099 = 1570
D. Let the number of boys = 7x and number of boys and girls = 17x According to the question, 7x = 1099 x = 157 Total number of boys and girls = 17 × x = 17 × 157 = 2669 Hence The number of girls = 2669 – 1099 = 1570

Explanations:

Let the number of boys = 7x and number of boys and girls = 17x According to the question, 7x = 1099 x = 157 Total number of boys and girls = 17 × x = 17 × 157 = 2669 Hence The number of girls = 2669 – 1099 = 1570