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Given the code: '+' stands for '-', '-' stands for '×', '×' stands for '÷', and '÷' stands for '+'. Which of the following equations is then correct?

1. 18 + 6 × 3 = 10
2. 18 - 6 ÷ 3 = 36
3. 18 × 6 - 3 = 1
4. 18 ÷ 6 + 3 = 21

Correct answer: 18 ÷ 6 + 3 = 21

Solution

Using the code, '÷' means '+', and '+' means '-'. So the option '18 ÷ 6 + 3 = 21' becomes '18 + 6 - 3 = 21', which is true. The other options do not remain correct after substitution.

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