A doctor prescribed 2 types of vitamin tablets, `T_1` & `T_2` for Mr. Dhawan. The tablet `T_1` contains 400 units of vitamin & `T_2` contains 250 units of vitamin. If his requirement of vitamin is at least 4000 units then the inequation for his requirement will be _______.

Answer

To solve the problem, we need to set up an inequality based on the information given about the vitamin tablets.

### Step-by-Step Solution:

1. **Define Variables**:
Let \( X \) be the number of tablets of type \( T_1 \) that Mr. Dhawan takes, and \( Y \) be the number of tablets of type \( T_2 \) that he takes.

2. **Vitamin Content in Tablets**:
- Each tablet \( T_1 \) contains 400 units of vitamin.
- Each tablet \( T_2 \) contains 250 units of vitamin.

3. **Total Vitamin Intake**:
The total amount of vitamin Mr. Dhawan gets from the tablets can be expressed as:
\[ \text{Total Vitamin} = 400X + 250Y \]

4. **Vitamin Requirement**:
According to the problem, Mr. Dhawan's requirement for vitamin intake is at least 4000 units. This can be expressed as an inequality:
\[ 400X + 250Y \geq 4000 \]

5. **Final Inequality**:
Therefore, the required inequality for Mr. Dhawan's vitamin intake is:
\[ 400X + 250Y \geq 4000 \]