Bacteria of species a and species b are kept in a single environment, where they are fed two nutrients. Each day the environment is supplied 19900 units of the first nutrient and 32190 units of the second nutrient. Each bacterium of species a requires 4 units of the first nutrient and 5 units of the second nutrient, and each bacterium of species b requires 1 unit if the first umnutrient and 6 units of the second nutrient. What populations of each species can coexist in the environment so that all the nutrients are consumed each day?