Question

My son has the following missing number pattern to solve.

Answer 1

The only complete pattern is the middle one
we see that 38-29=9
so the middle number minus the first number equals the third number
for the last row
21-1=20  so you have 1  21   20
for the first one

17- ?=37
54-17=37      54  17  37 

Answer 2

For the first one is 1,21,20

The second one is 54,17,37