Tedra harvests 1/2 * 400 kg = <<1/2*400=200>>200 kg of tomatoes on Thursday.
Tedra harvests 2000 kg - 400 kg - 200 kg = <<2000-400-200=1400>>1400 kg of tomatoes on Friday.
After giving away tomatoes to his friends, he is left with 1400 kg - 700 kg = <<1400-700=700>>700 kg of tomatoes.
#### 700