The ratio of girls to boys in a room is 9 : 11. If there are 980 students in the room, how many boys are there?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 539
In the ratio 9 : 11 the whole room is \(9+11=20\) parts and the boys are 11 of those parts.
1 part \(\displaystyle =\frac{980}{20}=49\)
Boys \(=11\times49=539\)
Check: girls \(=9\times49=441\), and \(441+539=980\)
There are 539 boys in the room.