Question

Sana scored an average of 23 marks in five subjects. She scored 25 marks in math, 22.5 marks in English, 21 marks in Hindi and 24.5 marks in Science. How many marks did she score in Social Science? Please show steps.​

Answer 1

Answer:

Sana's marks in Social Science is 22.

Step-by-step explanation:

Given marks in Maths = 25

Marks in English = 22.5

Marks in Hindi = 21

Marks in Science= 24.5

Let her marks in Social Science be 'x'

We know that Average = $\frac{Total marks}{Number of subjects}$

where Total marks = 25 + 22.5 + 21 + 24.5 + x = 93 + x

Number of subjects = 5

Average marks = 23 (Given)

Therefore, substituting the values in the formula, we get

23 =  $\frac{93+x}{5}$

=> 23 * 5 = 93 + x

=> 115 = 93 + x

=> 115 - 93 = x

=> 22 = x

Therefore, Sana's marks in Social Science is 22.