The constraint that in a particular XII class, number of boys(y) are less than number of girls(x) is given by_______________.

Answer

To solve the problem, we need to express the relationship between the number of boys (y) and the number of girls (x) in a particular class. The question states that the number of boys is less than the number of girls.

### Step-by-Step Solution:

1. **Identify the Variables**:
- Let \( x \) represent the number of girls in the class.
- Let \( y \) represent the number of boys in the class.

2. **Understand the Relationship**:
- According to the problem, the number of boys is less than the number of girls. This can be mathematically expressed as:
\[ y < x \]

3. **Formulate the Inequality**:
- The inequality \( y < x \) indicates that the number of boys (y) is strictly less than the number of girls (x).

4. **Final Expression**:
- Therefore, the constraint that the number of boys is less than the number of girls can be summarized as:
\[ y < x \]