Mathematics
Grade 6
15 min
Half-life and population doubling
Half-life and population doubling
Tutorial Preview
1
A population of 10 cells doubles every hour. How many cells are there after 3 hours?
2
A substance has a half-life of 1 day. If you start with 40 grams, how much is left after 2 days?
3
A colony of ants doubles every week. There are 160 ants now. How many were there 3 weeks ago?
Sample Practice Questions
Easy
A patch of 5 flowers doubles every day. How many flowers are there after 2 days?
0.10
1.15
2.20
3.25
Easy
You have 20 cookies. The amount has a half-life of 1 hour. How many are left after 2 hours?
0.10
1.5
2.2
3.0
Easy
A fish population doubles monthly. There are 40 fish now. How many were there 1 month ago?
0.10
1.20
2.80
3.160
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