Answer : 29
In each diagram multiply top two values and add their sum to give the bottom value.
In first rectangle, (6 * 4 ) + (6 + 4) = 34
In second rectangle, ( 8 * 5 ) + (8 + 5) = 53
Similarly, in last rectangle, (9 * 2) + (9 + 2) = 29
So, answer is 29