What will come in the place of (?) mark in following question.
`280 div 4 div 2 = 170 - ?`

Options

A. 105
B. 115
C. 125
D. 135

Answer

To solve the equation \( 280 \div 4 \div 2 = 170 - ? \), we will follow these steps:

### Step 1: Simplify the left side of the equation
We start with the left side of the equation, which is \( 280 \div 4 \div 2 \).

### Step 2: Perform the first division
First, we divide \( 280 \) by \( 4 \):
\[ 280 \div 4 = 70 \]

### Step 3: Perform the second division
Next, we take the result from the first division and divide it by \( 2 \):
\[ 70 \div 2 = 35 \]

### Step 4: Set up the equation
Now we can rewrite the equation with the simplified left side:
\[ 35 = 170 - ? \]

### Step 5: Solve for the question mark
To find the value of \( ? \), we rearrange the equation:
\[ 170 - ? = 35 \]
This can be rewritten as:
\[ ? = 170 - 35 \]

### Step 6: Perform the subtraction
Now, we calculate \( 170 - 35 \):
\[ 170 - 35 = 135 \]

### Final Answer
Thus, the value that comes in place of the question mark is:
\[ ? = 135 \]