By interchanging the given two numbers, which of the following equations will…
2024
By interchanging the given two numbers, which of the following equations will not be correct?
7 and 9
- A.
9 − 7 + 3 = 1
- B.
9 × 4 − 7 × 3 = 4
- C.
9 × 1 − 7 × 2 = −11
- D.
7 × 2 + 9 − 4 = 21
Attempted by 16 students.
Show answer & explanation
Correct answer: B
We need to interchange 7 and 9 in each option and find the equation that becomes false.
For option B:
9 × 4 − 7 × 3 = 4 becomes 7 × 4 − 9 × 3 = 4.
Left side = 28 − 27 = 1.
Since 1 is not equal to 4, this equation is not correct after interchanging.
Therefore, the correct answer is option B.