Pak Isa has 9 239 pumpkin seeds that he picked on Sunday while Pak Sahar was able to pick 3 458 pumpkin seeds in his garden.

1. How many pumpkin seeds did Mr. Isa and Mr. Sahar successfully collect that day?
2. There are some rotten pumpkin seeds which makes the total number of pumpkin seeds successfully collected is only 10345. State the unknown and its value from the situation.