If '-' stands for 'division', '+' for 'multiplication', '÷' for 'subtraction' and 'x' for 'addition', then which one of the following equations is correct?
Question and options
If '-' stands for 'division', '+' for 'multiplication', '÷' for 'subtraction' and 'x' for 'addition', then which one of the following equations is correct?
- 6 + 20 - 12 ÷ 7 - 1 = 38
- 6 - 20 ÷ 12 x 7 + 1 = 57
- 6 + 20 - 12 ÷ 7 x 1 = 62
- 6 ÷ 20 x 12 + 7 - 1 = 70
Answer and explanation
Correct answer: D - 6 ÷ 20 x 12 + 7 - 1 = 70
After substitution, 6 ÷ 20 x 12 + 7 - 1 = 70 reads 6 - 20 + 12 * 7 / 1 = 6 - 20 + 84 = 70, which is correct. The other three equations give 10-7 = 3 (not 38), 0.3-12+7 = -4.7 (not 57), and 10-7+1 = 4 (not 62).
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