Question

Average marks of 3 classes a,b,and c are 30,50,and 70. If avg marks of class a and b are 45 and class band c are 65 then what is the average of a,band c put it all together

Answer 1

Answer:

50 marks is the average marks

Answer 2

Answer:

The average marks of class A , B , C put together is 50 .

Step-by-step explanation:

Given as :

The average marks of class A = 30

The average marks of class B = 50

The average marks of class C = 70

The average marks of class A and B = 45

The average marks of class B and C = 65

Let The average marks of class A , B , C = x

According to question

The average marks of all three class = $\dfrac{marks class A + marks class B+ marks class C}{3}$

Or ,  x = $\dfrac{A + B + C}{3}$

Or, x = $\dfrac{30 + 50 + 70}{3}$

∴   x = $\dfrac{150}{3}$

i.e x = 50

So,  The average marks of class A , B , C = x = 50

Hence, The average marks of class A , B , C is 50 . Answer