Question

if the average marks of a class of 50 students in english is 25 and the average marks of the top 20 students is 40 then the average marks of rest of the students is​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

15

Step-by-step explanation:

Let the sum of the marks obtained by entire class be y.

Then,

y/50=25

y=25*50

y=1250

Let the sum of the marks obtained by top 20 students be x.

x/20=40

x=40*20

x=800

Let z be the sum of the marks obtained by rest of students

Now,

x+z=y  

z=y−x  

z=1250-800

z=450  

Total number of rest of students =50-20=30

Average marks obtained by rest of students

A=450/30

A=15