Answer:
3500
Step-by-step 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 = [tex]\frac{2}{4}=\frac{1}{2}[/tex]
Increase in number of germs in seven hours = [tex]\frac{7}{2}[/tex]
Therefore , number of germs in 7 hours = Increase in number of germs in seven hours × Number of germs initially
= [tex]\frac{7}{2}\times 1000=7\times 500=3500[/tex]
So, number of germs in 7 hours if the germs double in number every 4 hours = 3500
