Question

If 'x' means '+' and '+' means'-', which equation is incorrect?

• A. 8 x 3 + 2= 9
• B. 6 x 4 + 1 = 9
• C. 7 x 2 + 3 = 8
• D. 9 x 1 + 4 = 6

Answer 1

Answer:

C. 7 x 2 + 3 = 8

Given:

• × means +

• + means −

Check each equation after replacing the symbols:

1. 8 × 3 + 2 = 9
   → 8 + 3 − 2 = 9
   → 11 − 2 = 9 Correct

2. 6 × 4 + 1 = 9
   → 6 + 4 − 1 = 9
   → 10 − 1 = 9 Correct

3. 7 × 2 + 3 = 8
   → 7 + 2 − 3 = 8
   → 9 − 3 = 6 Not equal to 8

4. 9 × 1 + 4 = 6
   → 9 + 1 − 4 = 6
   → 10 − 4 = 6 Correct

Answer: 7 × 2 + 3 = 8 is the incorrect equation.