Sandy decided to do an experiment with a sandwich she left in her locker. She found it $3$ days after she had put it there, took it to the lab, and counted $41$ bacteria. $2$ days later she counted $153$ bacteria. She estimates that it will take $400$ bacteria to completely cover her sandwich.
How many days would it take this to happen, starting from the day she first put her sandwich in her locker?
I put it in a table so it can be easier to understand:
- $3$ days $= 41$ bacteria
- $5$ ($2$ days later) days = $153$ bacteria
I tried to identify what the problem was, but I am lost. Please help!