a certain type of bacteria doubles every 4 hours. If you started out with 37 bacteria, how many would you have after 12 hours?

Question

a certain type of bacteria doubles every 4 hours. If you started out with 37 bacteria, how many would you have after 12 hours? 

Answer 1

After 4 hours you have 37 x 2 = 74

After 8 hours you have 74 x 2 = 148

After 12 hours you have 148 x 2 = 296