Given,
A + B = 2C ----(i)
C + D = 2A----(ii)
Adding (i) and (ii) we get : A + B + C + D = 2C + 2A
=> B + D = A + C
On interchanging - and /, we get the equation as
5 + 3 x 8 / 12 - 4 = 3
or 5 + 3 x (2/3) - 4 = 3
or 3 = 3, which is true.
On interchanging + and - and 4 and 8 in (b),
we get the equation as
8 + 4 - 12 = 0
or 12 - 12 = 0
or 0 = 0, which is true.
By the Given data , We have the expression:
20 + 8 - 8 ÷ 4 × 2 = 20 + 8 - 2 × 2 = 20 + 8 - 4 = 24.
On interchanging + and x and 4 and 5 in (c),
we get the equation as
4 + 5 x 20 = 104 or 104 = 104, which is true.
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