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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Question : The ratio of the number of boys to the number of girls in a class is 2 : 5. If 10 boys leave the class and 20 new girls join the class, then the new ratio of boys and girls in the class becomes 4 : 25. What is the number of boys in the class now?

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Answer 1

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 $3 x$ and $8 x$ .
According to the question,
$3 x = 180$
⇒ $x = 60$
$∴$ Total girls $= 8 x = 8 \times 60 = 480$
Hence, the correct answer is 480.

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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: 380Option 2: 480Option 3: 660Option 4: 420

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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