Question : Directions: Select the correct equation after interchanging operations + and – and numbers 4 and 8.
Option 1: 2 + 8 – 4 = 9
Option 2: 8 + 4 – 2 = 10
Option 3: 4 – 8 + 11 = 1
Option 4: 4 – 8 + 11 = 8
Correct Answer: 4 – 8 + 11 = 1
Solution :
Let's check each option –
First Option:
2 + 8 – 4 = 9
On interchanging the mathematical signs and numbers, we get –
2 – 4 + 8 = 9
L.H.S. = 2 – 4 + 8 = 6
L.H.S.
≠
R.H.S.
Second Option:
8 + 4 – 2 = 10
On interchanging the mathematical signs and numbers, we get –
4 – 8 + 2 = 10
L.H.S. = 4 – 8 + 2 = –2
L.H.S.
≠
R.H.S.
Third Option:
4 – 8 + 11 = 1
On interchanging the mathematical signs and numbers, we get –
8 + 4 – 11 = 1
L.H.S. = 8 + 4 – 11 = 1
L.H.S.
=
R.H.S.
Fourth Option:
4 – 8 + 11 = 8
On interchanging the mathematical signs and numbers, we get –
8 + 4 – 11 = 4
L.H.S. = 8 + 4 – 11 = 1
L.H.S.
≠
R.H.S.
So, only the third option satisfies the equation. Hence, the third option is correct.
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