# doubling time

### A magic box has pennies in it that double every minute. If the box takes a full hour to become compl

A magic box has pennies in it that double every minute. If the box takes a full hour to become completely full, how long does it take for the box...
Thread by: math_celebrity, Feb 21, 2023, 0 replies, in forum: Calculator Requests

### Mike received a penny on December 1st. On December 2nd he received 2 cents. December 3rd another 4 c

Mike received a penny on December 1st. On December 2nd he received 2 cents. December 3rd another 4 cents and December 4th he received 8 cents. If...
Thread by: math_celebrity, Feb 5, 2023, 0 replies, in forum: Calculator Requests

### The population of a town doubles every 12 years. If the population in 1945 was 11,005 people, what w

The population of a town doubles every 12 years. If the population in 1945 was 11,005 people, what was the population in 1981? Calculate the...
Thread by: math_celebrity, Feb 6, 2022, 0 replies, in forum: Calculator Requests

### A population of 200 doubles in size every hour. What is the rate of growth of the population after 2

A population of 200 doubles in size every hour. What is the rate of growth of the population after 2.5 hours? Time 1: 400 Time 2: 800 Time 3:...
Thread by: math_celebrity, Jan 1, 2022, 0 replies, in forum: Calculator Requests

### Zombies are doubling every 2 days. If two people are turned into zombies today, how long will it tak

Zombies are doubling every 2 days. If two people are turned into zombies today, how long will it take for the population of about 600,000 to turn...
Thread by: math_celebrity, Nov 30, 2021, 0 replies, in forum: Calculator Requests

### A culture of bacteria doubles every hour. If there are 500 bacteria at the beginning, how many bacte

A culture of bacteria doubles every hour. If there are 500 bacteria at the beginning, how many bacteria will there be after 9 hours? Assumptions...
Thread by: math_celebrity, May 19, 2021, 0 replies, in forum: Calculator Requests

### if a teachers salary grows by 4% each year. How many years will it take to double.

if a teachers salary grows by 4% each year. How many years will it take to double. We can use the Rule of 72 at 4% to get 18 years
Thread by: math_celebrity, Feb 10, 2021, 0 replies, in forum: Calculator Requests

### A colony of 995 bacteria doubles in size every 206 minutes. What will the population be 618 minutes

A colony of 995 bacteria doubles in size every 206 minutes. What will the population be 618 minutes from now? Calculate the doubling time...
Thread by: math_celebrity, Mar 16, 2020, 0 replies, in forum: Calculator Requests

### A bacteria population increases every hour. At 12pm there are 5 cells. At 1pm there are 10 cells. At

A bacteria population increases every hour. At 12pm there are 5 cells. At 1pm there are 10 cells. At 2pm there are 20 cells. At 3pm there are 40...
Thread by: math_celebrity, Mar 10, 2020, 0 replies, in forum: Calculator Requests

### A city doubles its size every 48 years. If the population is currently 400,000, what will the popula

A city doubles its size every 48 years. If the population is currently 400,000, what will the population be in 144 years? Calculate the doubling...
Thread by: math_celebrity, Feb 27, 2020, 0 replies, in forum: Calculator Requests

### A bunny population is doubling every 2 years. There are currently 45 bunnies. How many will there be

A bunny population is doubling every 2 years. There are currently 45 bunnies. How many will there be in 10 years? Find the number of doubling...
Thread by: math_celebrity, Nov 27, 2019, 0 replies, in forum: Calculator Requests

### A super deadly strain of bacteria is causing the zombie population to double every day. Currently, t

A super deadly strain of bacteria is causing the zombie population to double every day. Currently, there are 25 zombies. After how many days will...
Thread by: math_celebrity, Nov 4, 2019, 0 replies, in forum: Calculator Requests

### Bacteria in a petra dish doubles every hour. If there were 34 bacteria when the experiment began, wr

Bacteria in a petra dish doubles every hour. If there were 34 bacteria when the experiment began, write an equation to model this. Let h be the...
Thread by: math_celebrity, May 25, 2019, 0 replies, in forum: Calculator Requests

### A towns population is currently 500. If the population doubles every 30 years, what will the populat

A towns population is currently 500. If the population doubles every 30 years, what will the population be 120 years from now? Find the number of...
Thread by: math_celebrity, Apr 12, 2019, 0 replies, in forum: Calculator Requests

### A population of wolves on an island starts at 5 if the population doubles every 10 years, what will

A population of wolves on an island starts at 5 if the population doubles every 10 years, what will be the population in 90 years? If the...
Thread by: math_celebrity, Mar 29, 2019, 0 replies, in forum: Calculator Requests

### A certain culture of the bacterium Streptococcus A initially has 8 bacteria and is observed to doubl

A certain culture of the bacterium Streptococcus A initially has 8 bacteria and is observed to double every 1.5 hours.After how many hours will...
Thread by: math_celebrity, Mar 17, 2019, 0 replies, in forum: Calculator Requests