The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is (1) 40                                                            (2) 20 (3) 80                                                            (4) 60

Explanation

To solve the problem step by step, we can follow these calculations:

### Step 1: Define Variables
Let the number of boys in the class be \( x \) and the number of girls be \( y \).

### Step 2: Write the Average Marks Equations
The average marks of boys is given as 52, and for girls, it is 42. The combined average marks of boys and girls is 50. We can express this mathematically:

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