If '+' means '–', '–' means '+', 'x' means '÷', then $50+10-5\times 5=?$

The correct option is 41.

To solve this problem, we need to decode the mathematical operators based on the given rules and then evaluate the resulting expression using the standard order of operations (BODMAS/PEMDAS rule: Division, Multiplication, Addition, Subtraction).

Step 1: Understand the operator replacements
According to the problem statement:
• '+' means '–'
• '–' means '+'
• '×' means '÷'

Step 2: Rewrite the given expression
The original expression is:

$50+10-5\times 5$

Replacing the operators according to the given conditions gives:

$50-10+5÷5$

Step 3: Evaluate the new expression using the order of operations

First, perform the division ($5÷5$):

$50-10+1$

Next, perform addition and subtraction from left to right:
Subtract 10 from 50:

$40+1$

Finally, add 1:

$41$

Hence, the final answer is 41.