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If ‘×’ = ‘÷’, ‘÷’ = ‘+’, ‘+’ = ‘-’, and ‘-’ = ‘×’, which equation is correct?

1. 16 × 4 + 2 ÷ 2 = 14
2. 18 - 6 × 3 + 2 ÷ 1 = 20
3. 20 + 5 - 5 × 1 ÷ 2 = 15
4. 12 ÷ 4 + 2 × 2 = 15

Correct answer: 12 ÷ 4 + 2 × 2 = 15

Solution

Using the given replacements, × becomes ÷, ÷ becomes +, + becomes -, and - becomes ×. In option D, 12 ÷ 4 + 2 × 2 becomes 12 + 4 - 2 ÷ 2, which evaluates to 15 after applying the intended substitutions and order of operations. Therefore, option D is correct.

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