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- Write the ratio clearly.
- Find the common multiplier.
- Apply it to the missing term.
Correct Answer: B
Correct Answer: B
Method / Topic: Ratio and Proportion
The answer keeps the ratio proportional.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Ratio and Proportion
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px">Total ratio parts = 5+4 = 9. These 9 parts represent 45 students, so 1 part = 45/9 = 5 students. Girls have 4 parts, so girls = 4×5 = 20. Therefore, the number of girls is 20.</td>
</tr>
</tbody>
</table>
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write the ratio clearly.
- Find the common multiplier.
- Apply it to the missing term.
The ratio of boys to girls in a class is 5:4. If there are 45 students in total, how many girls are there?
Explanation
Correct Answer: B
Method / Topic: Ratio and Proportion
The answer keeps the ratio proportional.
Short Explanation
Detailed Explanation
Correct Answer: B
Method / Topic: Ratio and Proportion
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px">Total ratio parts = 5+4 = 9. These 9 parts represent 45 students, so 1 part = 45/9 = 5 students. Girls have 4 parts, so girls = 4×5 = 20. Therefore, the number of girls is 20.</td>
</tr>
</tbody>
</table>
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