A brain teaser with nine squares, one missing a number.
The challenge is to figure out how the numbers are related and fill in the missing ones.
Can you solve it?
Filling in the missing number requires determining the pattern of how the numbers are related to each other and following it through.
Can you figure out what the missing number is?
A
B
C
ANSWER
The correct answer is number 18.
A neat pattern appears in each row:
third number = first number + 2 × second number
Row 1:4+ 2 x 8 = 4+ 16 = 20
Row 2: 9+2 x 3 = 9 +6 = 15
Row 3: 6+2 x 6 = 6+12 = 18
So the missing number is 18.