Triangle Math Puzzle: Can you solve this in 15 seconds?

Step-by-Step Solution

Triangle 1 (Top):

Outside numbers: 20, 6, and 8

Calculation: 20+6+8 = 34

Result: 34 (Matches the center)

Triangle 2 (Bottom Left):

Outside numbers: 12, 6, and 5

Calculation: 12+6+5 = 23

Result: 23 (Matches the center)

Triangle 3 (Bottom Right):

Outside numbers: 9, 4, and 2

Calculation: 9+4+2 = ?

Result: 15

Final Answer

The value of the question mark is 15.