$(3 + 5) + 7 = 3 + (5 + 7) = ?$

10

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15

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Not possible

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None of the above

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Solution

The correct option is B $15$
Regrouping of numbers during addition has no influence on the outcome, it does make adding easier.

$\Rightarrow (3 + 5) + 7 = 8 + 7 = 15$
And, $3 + (5 + 7) = 3 + 12 = 15$
$\Rightarrow (3 + 5) + 7 = 3 + (5 + 7) = 15$

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