Which two signs should be interchanged to make the given equation correct?
40 + 8 × 6 ÷ 3 – 4 = 29
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → + and ÷
Make the interchange of an option, then work out the left side by BODMAS: division and multiplication first, then addition and subtraction from left to right.
Interchanging + and ÷ gives 40 ÷ 8 × 6 + 3 – 4
\(40\div8\times6=5\times6=30\)
\(30+3-4=29\), which equals the right side
Why the other options are incorrect
Option (1) × and – — Incorrect. 40 + 8 – 6 ÷ 3 × 4 \(=\) 40, not 29.
Option (2) + and – — Incorrect. 40 – 8 × 6 ÷ 3 + 4 \(=\) 28, not 29.
Option (4) × and ÷ — Incorrect. 40 + 8 ÷ 6 × 3 – 4 \(=\) 40, not 29.