What should come in place of question mark (?) in the following questions ?
252 + 520 `div` 20 + 420 = 121 + ?

Options

A. 587
B. 577
C. 527
D. 477

Answer

To solve the equation \( 252 + \frac{520}{20} + 420 = 121 + ? \), we will follow the order of operations (BODMAS/BIDMAS).

### Step-by-Step Solution:

1. **Identify the operations**: The expression consists of addition and division. According to the order of operations, we need to perform the division first.

2. **Perform the division**:
\[ \frac{520}{20} = 26 \]
Now, substitute this back into the equation:
\[ 252 + 26 + 420 = 121 + ? \]

3. **Simplify the left side**:
\[ 252 + 26 = 278 \]
Now add 420:
\[ 278 + 420 = 698 \]
So now the equation looks like:
\[ 698 = 121 + ? \]

4. **Isolate the question mark**: To find the value of \( ? \), we subtract 121 from both sides:
\[ ? = 698 - 121 \]

5. **Calculate the right side**:
\[ 698 - 121 = 577 \]

Thus, the value that should come in place of the question mark (?) is **577**.

### Final Answer:
The answer is \( 577 \).