Answer:
59 bacteria would there be after 4 hours.
Step-by-step explanation:
Given:
Bacteria in the petri dish = 40
Time taken for the bacteria to be doubled =17 hours
To Find:
To Find the number bacteria left after 4 hours = ?
Solution:
By using the proportionality,
After 17 hours the number of bacteria will be 80.
Let the number of bacteria after 4 hours be x
then
Now by cross multiplication
x= 18. 82
So the number of bacteria after 4 hours will be
= 40 + 18.82
= 58.82
=59
Yes that is correct always
Answer : 4.5 × 10⁴ square inches can be washed per hour.
Step-by-step explanation :
As we are given that an area can be washed at a rate of 4,900 cm²/min. Now we have to determine the square inches can be washed per hour.
Given conversions are:
1 cm = 0.39 in and 1 hr = 60 min
As, 1 cm² = (0.39)² in² and 1 min = 1/60 hr
So, 
Now we have to determine the square inches can be washed per hour.
As,
So, 
Therefore, 4.5 × 10⁴ square inches can be washed per hour.
Area=length*height
Area=(25)*(8)
Area=200 feet^2
