If (31 + 15) + x = 31 + (15 + 23), then by associativity of addition x =

(a) 46 (b) 38 (c) 23 (d) 69

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Solution

Here, (31 + 15) + x = 31 + (15 + 23).
But, by associativity of addition, we have
(31 + 15) + 23 = 31 + (15 + 23)
So, comparing (31 + 15) + x = 31 + (15 + 23) and (31 + 15) + 23 = 31 + (15 + 23), we have
x = 23
Hence, the correct option is (c).

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