Question
Study the pattern. What is the missing number?
Number 1 Number 2 Number 3 Number 4
10 20 30 ?
20 30 40 50
3 m

Click button first when a symbol is required. X

Study the pattern. What is the missing number?
Number 1 Number 2 Number 3 Number 4
10 20 30 ?
20 30 40 50