Answer :
Answer:
60
Step-by-step explanation:
Let's identify what the sequence could be:
100 + 20 = 120
120 - 60 = 60
60 + 20 = 80
80 - 40 = 40
It looks like it is add 20, and then subtract the next number by half of itself.
Therefore, the next number is 40+20=60.
