30 and 70 Check: 30+70 = 100 and 30*70 = 2100
70
If I had to, I would use 20 and 70.
121
40
The sum of 70 + 30 + 1250 + 50 + 100 = 1500
The sum of these numbers is 563.
the sum for 20 + 40 + 70 + 80 = 210
30 and 70 Check: 30+70 = 100 and 30*70 = 2100
70 + 80 + 70 + 30+ 80 + 80+ 80 = 490
30+70 = 100
30 + 50 + 70 = 150
80 - 10 = 30 + 40Both sides of the sum now equal 70.
4 plus 10 plus 16 plus 70 equals 100. To find the sum of this series, simply add all the numbers together.
The answer = 3500
The sum of the equation - 990 + 880 +90 +790 +690 + 70, is found as follows;990 + 880 +90 +790 +690 + 70= (990 + 880) + (90 +790) + (690 + 70)= ( 1870 ) + (880 ) + ( 760 )= 3510Answer = 3510
-20