Question

the average marks in science of student if 89 what us the sum of their marks​

Answer 1

Answer:

Surface area of a sphere=4πr  

2

=154cm  

2

 

⇒4×  

7

22

​  

r  

2

=154cm  

2

 

⇒r  

2

=  

4

154

​  

×  

22

7

​  

 

⇒r  

2

=  

4

49

​  

 

⇒r=  

4

49

​  

 

​  

 

∴r=  

2

7

​  

=3.5cm

Volume of the sphere=  

3

4

​  

πr  

3

 

=  

3

4

​  

×  

7

22

​  

×(3.5)  

3

 

=  

21

88

​  

×42.875‬=179.67cm  

3

Step-by-step explanation:

Answer 2

Answer:

Let me tell you first that the formula to find average is :

Sum of all values / total no. of values

Now, A.T.Q

(A+B+C+D+E)/5 = 82

A+B+C+D+E = 82×5=410

(A,B,C,D,E are supposed to be the five subjects)

It is given,

(A+B)/2 =86.5

So, A+B= 173

Also,

(D+E)/2 =84

D+E = 168

Putting these values in the equation:

173+C+168 = 410

C = 410–173–168

C= 69

Thus, you get your answer as 69 marks

Step-by-step explanation:

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