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
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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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