Question

the average marks of 50 students in class is 72. the average marks of boys is 70 and that of girl is 75. find no of boys​

Answer 1

Step-by-step explanation:

plz mark the brilliant answer

Answer 2

Answer:

The Number of boys is 30.

Step-by-step explanation:

Given:

The average marks of 50 students in class is 72. the average marks of boys is 70 and that of girl is 75.  

To find:

Find no of boys

Solution:

Let the number of students = 50

Let the number of boys be n, girls be 50 – n

(n $\times$ 70) + (50 – n) $\times$ 75 = 50$\times$ 72

5n = 150, n = 30 boys

Result:

The Number of boys is 30.

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