Which two numbers and two signs should be interchanged in the following…
2023
Which two numbers and two signs should be interchanged in the following equation to make it correct?
4 + 2 ÷ 7 + 8 × 9 = 25
- A.
4 and 9, + and ×
- B.
4 and 7, ÷ and ×
- C.
4 and 9, ÷ and ×
- D.
4 and 7, + and ×
Attempted by 2 students.
Show answer & explanation
Correct answer: C
Interchange the numbers 4 and 9, and also interchange the signs division and multiplication.
The expression becomes 9 + 2 x 7 + 8 / 4.
Using standard precedence: 9 + 14 + 2 = 25.
Therefore the required interchange is 4 and 9, division and multiplication.