To subtract these mixed numbers, we first need to convert each mixed number to an improper fraction.

31 1/5 = (531 + 1)/5 = 156/5
43/50 = 43/50
4 1/10 = (104 + 1)/10 = 41/10

Now, let's subtract:

156/5 - 43/50 - 41/10
= (15610)/5 - (432)/100 - (41*5)/10
= 3120/5 - 86/100 - 205/10
= 624 - 0.86 - 20.5
= 603.14

Therefore, (31 1/5 - 43/50) - 4 1/10 = 603.14