Maths Puzzles With Answers #47

Maths Puzzles With Answers #47

Solution :

The number at the center of each triangle equals the sum of the lower two numbers minus the top number.

First Triangle: 

       Middle Number 12 = ( 7 + 9 ) - 4 = 16 - 4 = 12

Second Triangle :

       Middle Number,  4 = (1 + 4 ) - 1 =  5 - 1 = 4

Third Triangle :

       Middle Number,  ? = ( 6 + 5 ) - 2 = 11 - 2 = 9 

So answer is  9