Question

A scientist is looking at 1000 germs under a microscope

andfinds that the germs double in number every 4 hours.
Using,
how many germs will there be in 7 hours.

Answer 1

3500

Explanation:

Number of germs that a scientist can see under a microscope = 1000 germs

We need to find how many germs will there be in 7 hours if the germs double in number every 4 hours .

It's given that the germs double in number every 4 hours .

So, increase in number of germs in one hour =
`(2)/(4)=(1)/(2)`

Increase in number of germs in seven hours =
`(7)/(2)`

Therefore , number of germs in 7 hours = Increase in number of germs in seven hours × Number of germs initially

=
`(7)/(2)* 1000=7* 500=3500`

So, number of germs in 7 hours if the germs double in number every 4 hours = 3500