Find $' a'$ so that the statement becomes true :
$(43 + a) + 77 = 43 + (95 + 77)$

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Solution

Addition is associative: This property says that changing the grouping of the addends does not change the sum.
i.e. $a + (b + c) = (a + b) + c$
$(43 + a) + 77 = 43 + (95 + 77) a = 95$
Therefore, the value of $a$ is $95$ .

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