Question : In a college, the ratio of the number of boys to girls is 3 : 8. If there are 180 boys, then how many girls are in the college?
Option 1: 380
Option 2: 480
Option 3: 660
Option 4: 420
Correct Answer: 480
Solution :
Given: Total boys = 180
The ratio of the number of boys to girls is 3 : 8
Let the number of boys and girls be $3x$ and $8x$.
According to the question,
$3x=180$
⇒ $x=60$
$\therefore$ Total girls $=8x=8\times60=480$
Hence, the correct answer is 480.
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