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If '+' means '-', '-' means '+', and 'x' means '/', then what is the value of 50 + 10 - 5 x 5?

1. 41
2. 60
3. 65
4. 70

Correct answer: 41

Solution

Replace the symbols as given: '+' becomes '-', '-' becomes '+', and 'x' becomes '/'. So the expression becomes 50 - 10 + 5 / 5. Now evaluate division first: 5 / 5 = 1, then compute 50 - 10 + 1 = 41.

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