If every bacterium reproduces then after 20 minutes a population of 8 bacteria will have grown approximately to what size apex?

If each bacterium reproduces every 20 minutes, the population will double in size during that time. Starting with 8 bacteria, after 20 minutes, the population would double to 16. After another 20 minutes (40 minutes total), it would double again to 32. Therefore, after 20 minutes, the population of 8 bacteria will have grown to approximately 16 bacteria.