If x + 12 = 12 + 7, then by commutativity of addition x =

(a) 12 (b) 7 (c) 19 (d) 5

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Solution

Here, x + 12 = 12 + 7.
But, by commutative of addition, we have
7 + 12 = 12 + 7
So, comparing x + 12 = 12 + 7 and 7 + 12 = 12 + 7, we have
x = 7
Hence, the correct option is (b).

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If x + 12 = 12 + 7, then by commutativity of addition x = (a) 12 (b) 7 (c) 19 (d) 5

Here, x + 12 = 12 + 7. But, by commutative of addition, we have 7 + 12 = 12 + 7 So, comparing x + 12 = 12 + 7 and 7 + 12 = 12 + 7, we have x = 7 Hence, the correct option is (b).

If x + 12 = 12 + 7, then by commutativity of addition x =

(a) 12 (b) 7 (c) 19 (d) 5

Here, x + 12 = 12 + 7.
But, by commutative of addition, we have
7 + 12 = 12 + 7
So, comparing x + 12 = 12 + 7 and 7 + 12 = 12 + 7, we have
x = 7
Hence, the correct option is (b).