The table represents the data about the number of students studying in Delhi Public School. Further, it is known that a total of 2000 students are studying in the school from Class 5th to Class 10th.
What is the ratio of the number of boys studying in class 9th to the number of the girls studying in class 10th and class 5th combined?
Solution
Total number of students in Class 10th = $$\frac{30}{100}\times 2000$$ = 600
Out of these 600 students, the number of boys students in class 10th = $$\frac{80}{100}\times 600$$ = 480
The number of girls students in class 10th = $$\frac{20}{100}\times 600$$ = 120
In similar way we can calculate number of boys and girls in each class. Tabulating the same data
From the table we can see that,
The number of boys studying in class 9th = 300
Sum of the number of the girls studying in class 10th and class 5th = 120 + 90 = 210
Hence, the required ratio = 300 : 210 = 10 : 7
Therefore, option A is the correct answer.
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