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If ‘+’ means ‘−’, ‘−’ means ‘×’, ‘×’ means ‘÷’, and ‘÷’ means ‘+’, then which equation is 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 given code, ‘÷’ becomes ‘+’ and ‘+’ becomes ‘−’. So the option 18 ÷ 6 + 3 becomes 18 + 6 − 3, which equals 21. Hence this is the correct equation.

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