Question

Identify the rule and find the missing number in place of the question mark.

21	56	70
45	87	84
115	180	?

Answer 1

in the first row

56-21=35
35x2=70
in the second row
87-45=42
42x2 =84
same as the third row
180-115=65
65 x2=130

answer is 130