Question

there are total 280 students in 3 section a b and c of a class. the number of section a students is a is 28 more than section c. the average mark of all three section is 36.the average mark of section b section is 28. the section a and c average is equal to 42.what is the difference between number of students in b and c​

Answer 1

Answer:

Total number of students in section A and B = 25 + 20 = 45

Average score of both the sections = 28

∴ Total score of both the sections = 28 x 45 = 1260

Total score of section A = 25 x 30 = 750

Let the average score of section B = x

Then, total score of section B = 20x

Given, 20x + 750 = 1260

⇒20x=510

⇒x=25.5

Step-by-step explanation: