First find the number of seeds that land in water: 300 seeds * 1/3 = <<300*1/3=100>>100 seeds
Then find the number of seeds that are eaten: 300 seeds * 1/6 = <<300*1/6=50>>50 seeds
Subtract the number of seeds that are destroyed to find the number that sprout: 300 seeds - 100 seeds - 50 seeds = <<300-100-50=150>>150 seeds
Then divide that number by 2 to find the number of sprouts that survive: 150 seeds / 2 = <<150/2=75>>75 seeds
#### 75