Question

.Maya, Madhura and Mohsina are friends studying in the same class. In a class test in geography,

Maya got 16 out of 25. Madhura got 20. Their average score was 19. How much did Mohsina

score?​

Answer 1

Answer:

Step-by-step explanation:

Mean = 16 + 20 + x / 3

19 = 36 + x / 3

57 = 36 + x

x = 57 - 36 = 21

Answer 2

Given :-

Maya got 16 out of 25.

Madhura got 20.

Average score = 19

To Find :-

How much did Mohsina  score?​

Analysis :-

Consider Mohsina's present age as a variable.

Substitute the values in the formula of mean.

Then find the value of the variable accordingly.

Solution :-

Let Mohsina's score be 'x'.

By the formula,

$\underline{\boxed{\sf Average \ mean=\dfrac{Total \ observations}{Number \ of \ observations } }}$

Given that,

Average score = 19

Substituting their values,

19 = 16 + 20 + x/3

19 = 36 + x/3

36 + x = 19 × 3

57 = 36 + x

x = 57 - 36

x = 21

Therefore, Mohsina's score is 21.