Question : Directions: Select the correct equation after interchanging the operators – and × and the numbers 4 and 3.
Option 1: 9 – 4 × 3 = 21
Option 2: 4 – 3 × 9 = 3
Option 3: 3 × 4 – 9 = 9
Option 4: 3 × 9 – 4 = 4
Correct Answer: 4 – 3 × 9 = 3
Solution :
Let's check each option –
First Option:
9 – 4 × 3 = 21
On interchanging the mathematical signs and numbers, we get –
9 × 3 – 4 = 21
L.H.S. = 9 × 3 – 4 = 27 – 4 = 23
L.H.S. ≠ R.H.S.
Second Option:
4 – 3 × 9 = 3
On interchanging the mathematical signs and numbers, we get –
3 × 4 – 9 = 3
L.H.S. = 3 × 4 – 9 = 12 – 9 = 3
L.H.S. = R.H.S.
Third Option:
3 × 4 – 9 = 9
On interchanging the mathematical signs and numbers, we get –
4 – 3 × 9 = 9
L.H.S. = 4 – 3 × 9 = 4 – 27 = –23
L.H.S. ≠ R.H.S.
Fourth Option:
3 × 9 – 4 = 4
On interchanging the mathematical signs and numbers, we get –
4 – 9 × 3 = 3
L.H.S. = 4 – 9 × 3 = 4 – 27 = –23
L.H.S. ≠ R.H.S.
So, only the second option satisfies the equation. Hence, the second option is correct.
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