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If ‘×’ means ‘+’ and ‘+’ means ‘−’, which equation is incorrect?

1. 8 × 3 + 2 = 9
2. 6 × 4 + 1 = 9
3. 7 × 2 + 3 = 8
4. 9 × 1 + 4 = 6

Correct answer: 7 × 2 + 3 = 8

Solution

Using the given meanings, $\times$ becomes $+$ and $+$ becomes $-$. So the options evaluate as: $8+3-2=9$, $6+4-1=9$, $7+2-3=6$, and $9+1-4=6$. The third equation is incorrect because it gives 6, not 8.

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