By rearranging the given numbers, evaluate:
(iii) $21 + 22 + 23 + 24 + 25 + 75 + 76 + 77 + 78 + 79$

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Solution

$21 + 22 + 23 + 24 + 25 + 75 + 7677 + 78 + 79$
$= (21 + 79) + (22 + 78) + (23 + 77) + (24 + 76) + (25 + 75)$ [By associative law]
$= 100 + 100 + 100 + 100 + 100$
$= 500$
So, the required sum of given number is $500$ .

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