By re-arranging the given numbers, evaluate: $21 + 22 + 23 + 24 + 25 + 75 + 76 + 77 + 78 + 79$

Open in App

Solution

$21 + 22 + 23 + 24 + 25 + 75 + 76 + 77 + 78 + 79$
$= (21 + 79) + (22 + 78) + (23 + 77) + (24 + 76) + (25 + 75)$ (By associative law)
$= 100 + 100 + 100 + 100 + 100$
$= 500$ .

Suggest Corrections

Similar questions

21 + 22 + 23 + 24 + 25 + 75 + 76 + 77 + 78 + 79

21, 21, 22, 23, 23, 24, 24, 24, 24, 25

25

83, 83, 75, 81, 81, 76, 79, 83, 81, 77, 77, 80, 76, 80

21, 23, 25, 23, 21, 24, 22, 20, 23

Join BYJU'S Learning Program