<human>:  Remi prepared a tomato nursery and planted tomato seedlings. After 20 days, the seedlings were ready to be transferred. On the first day, he planted 200 seedlings on the farm. On the second day, while working alongside his father, he planted twice the number of seedlings he planted on the first day. If the total number of seedlings transferred to the farm on these two days was 1200, how many seedlings did his father plant?
<bot>: How many seedlings did Remi plant on the second day? ** On the second day, he planted 2 * 200 seedlings = <<2*200=400>>400 seedlings.
How many seedlings did Remi plant on the two days? ** The total number of seedlings Remi planted on the two days is 400 seedlings + 200 seedlings = <<400+200=600>>600 seedlings.
How many seedlings did Remi's father plant? ** If the total number of seedlings transferred from the nursery was 1200 after the second day, Remi's father planted 1200 seedlings - 600 seedlings = <<1200-600=600>>600 seedlings.
#### 600