SOLUTION: The numbers in each of the three brackets follow the same rule. Find the missing number. [19, 25, 3] [4, 26, 11] [?, 51, 9] A 20 B 31 C 33 D 34 I cannot find any comm

Algebra ->  Sequences-and-series -> SOLUTION: The numbers in each of the three brackets follow the same rule. Find the missing number. [19, 25, 3] [4, 26, 11] [?, 51, 9] A 20 B 31 C 33 D 34 I cannot find any comm      Log On


   

Question 1020885: The numbers in each of the three brackets
follow the same rule. Find the missing
number.
[19, 25, 3] [4, 26, 11] [?, 51, 9]
A 20
B 31
C 33
D 34
I cannot find any common rule?
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
[19, 25, 3]-> common rule:%2825-19%29%2F2=6%2F2=3
[4, 26, 11] ->%2826-4%29%2F2=22%2F2=11
[x, 51, 9]->%2851-x%29%2F2=9->51-x=18->51-18=x->x=33
[33, 51, 9]
so, answer is:
C 33

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
x = 51 - 2*9   --->   x = 51 - 18 = 33.

Guessing numbers is not Math. It is puzzling.