10
122
10 ten
10.
Each number is multiplied by negative 2 to get the next number. 5 x -2 = -10 -10 x -2 = 20 20 x -2 = -40 -40x -2 = 80 So the next logical number in the series 5 10 20 -40 would be 80.
30
7
what number is next in the sequence: 10,20,30,20,(? 30
20
20
16*3 = 48
24