Which one will replace the question mark?

(7 x 3) + 8 = 29

(4 x 3) + 7 = 19

(5 x ?) + 6 = 31

? = 5.

(16)² = 256

Therefore, (2)² = 4.

The numbers are squared in ascending order

In first circle,

(3)² = 9

(4)² = 16

(5)² = 25

(6)² = 36.

In second circle,

(4)² = 16

(5)² = 25

(6)² = 36

(7)² = 49.

In third circle,

(6)² = 36

(7)² = 49

(8)² = 64

(9)² = 81.

5 x 8 x 10 = 400

and 6 x 9 x 7 = 378

Therefore 5 x 7 x ? = 315

? = 9.

(12 + 18 + 30)/10 = 6

(16 + 24 + 40)/10 = 8

Similarly, (45 + 18 + 27)/10 = 9.

(18 x 12)/3 = 72

and (32 x 16)/4 = 128

Therefore, (24 x 14)/? = 112

(336/?) = 112

? = (336/112)

? = 3.

(15 - 12) + (10 - 9) = 4

(28 - 12) + (16 - 20) = 12

Similarly, (23 -11) + (15- 16) = 11.

(2)³ + (1)³ + (3)³ = 36

and (0)³ + (4)³ + (3)³ = 91

Therefore, (4)³ + (2)³ + (1)³ = 73.

(30 - 24) x 8 = 48

and (23 - 12) x 8 = 88

Therefore, (92 - 86) x 8 = 48.

(6 + 5) - (7 + 4) = 0

and (7 + 6) - (8 + 4) = 1

Therefore (11 + 2) - (2 + 0) = 11.