Question

type the missing numbers.
-20 20 40 60
submit

Explanation:

Step1: Find the interval between marks

The distance between -20 and 20 is $20 - (-20) = 40$, and there's 2 intervals (from -20 to first blank, first blank to 20). So each interval is $\frac{40}{2}=20$.

Step2: Find the first missing number

Starting from -20, add 20: $-20 + 20 = 0$.

Step3: Find the second missing number

Starting from 60, add 20: $60 + 20 = 80$.

Step4: Find the third missing number

Starting from 80, add 20: $80 + 20 = 100$.

Answer:

0, 80, 100