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RS Aggarwal Solutions Class 7 Mathematics Solutions for Percentage Exercise 10B in Chapter 10 - Percentage

Question 5 Percentage Exercise 10B

70% of the student in a school are boys and the number of girls is 504. Find the number of boys in

the school.

Answer:

Solution:-

Let the total number of students be 100

Then, as per the question, 70% of boys = 70

Number of girls = 30

Now, the total number of students when the number of girls is 30 = 100

Then, the total number of students when the number of girls is 504 = (100/30) × 504

= 1680

Total number of boys = 1680 – 504

= 1176

∴the number of boys in a school is 1176

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