There are twice as many boys as there are girls if 30% of the boys and 45% of the girls failed in the exams then. What percentage of the class passed the exams?
- 65%
- 40%
- 52%
- None of these
Explanation
Let's say the number of girls is x. Then, the number of boys is 2x (since there are twice as many boys as girls).
Total students = x (girls) + 2x (boys) = 3x
Now, let's calculate the number of students who failed:
Girls who failed = 45% of x = 0.45x
Boys who failed = 30% of 2x = 0.6x
Total students who failed = 0.45x + 0.6x = 1.05x
Now, let's calculate the number of students who passed:
Total students who passed = Total students - Total students who failed
= 3x - 1.05x
= 1.95x
Percentage of students who passed = (1.95x / 3x) × 100%
= 65%
Related MCQs
- 20,000
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اس سوال کو وضاحت کے ساتھ پڑھیں
- 20% decrease
- 24% decrease
- 16% increase
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 25% decrease
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- 16.67% decrease
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
