5683 + 6077 = (a)  

2930 + 1874 = (a)  

8737 + 3372 = (a)  

3474 + 2575 = (a)  

5087 + 4151 = (a)  

6684 + 7296 = (a)  

5136 + 1599 = (a)  

5049 + 1340 = (a)  

11956 + 8385 = (a)  

8493 + 4074 = (a)  

7802 + 9038 = (a)  

1032 + 8106 = (a)  

8216 + 9461 = (a)  

2520 + 1731 = (a)