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?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 1570.
Let the number of boys and the total number of boys and girls in that school be 7x and 17x
Now,
Number of girls in that school = 17x - 7x = 10x
According to the question;
⇒ 7x = 1099
⇒ x = 157
Hence, the number of girls in that school = 10x
⇒ 10 × 157 = 1570