20 + 40 = 60
the answer to 20 + 20 = 40
the sum for 20 + 40 + 70 + 80 = 210
40
3x + 2(30-x) = 40 3x + 60 - 2x = 40 x = -20
30
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90 + 100 = 550
20 + 40 = 60
It is: 20+20 = 40
The two numbers are 25 and 15
These may help you answer your questions: 1, 2, 4, 5, 8, 10, 20 and 40.
the answer to 20 + 20 = 40
the sum for 20 + 40 + 70 + 80 = 210
20+20=40 20x20=400
40
20 30 40 56
40 (+20, -10, +30 ,-20)