What will come in place of the question mark (?) in the following questions ?
`1400xx?=1050`

Options

A. `1/4`
B. `3/4`
C. `3/5`
D. `2/3`

Answer

To solve the equation \( 1400 \times ? = 1050 \), we need to find the value that will replace the question mark. Let's denote the question mark as \( x \).

### Step-by-Step Solution:

1. **Set up the equation**:
\[ 1400 \times x = 1050 \]

2. **Isolate \( x \)**:
To find \( x \), we can divide both sides of the equation by 1400:
\[ x = \frac{1050}{1400} \]

3. **Simplify the fraction**:
We can simplify \( \frac{1050}{1400} \) by dividing both the numerator and the denominator by their greatest common divisor (GCD). First, we can cancel out the common zeros:
\[ x = \frac{105}{140} \]

4. **Further simplification**:
Now, we can simplify \( \frac{105}{140} \) by dividing both the numerator and the denominator by 5:
\[ x = \frac{21}{28} \]
Next, we can simplify \( \frac{21}{28} \) by dividing both by 7:
\[ x = \frac{3}{4} \]

5. **Final answer**:
Therefore, the value that comes in place of the question mark is:
\[ x = \frac{3}{4} \]

### Conclusion:
The answer is \( \frac{3}{4} \).