How many days does a scientist grow a culture of 3000 cells at 7% growth per day to increase the number of cells by 630?
2 days
3 days
8 days
10 days
The Correct Answer is B
To find out how many days it takes for a culture of 3000 cells growing at a rate of 7% per day to increase by 630 cells, follow these steps:
Determine the daily growth:
Daily growth rate=7%=0.07
Calculate the daily increase in cells:
Daily increase=3000×0.07=210 cells per day
Determine the total increase needed:
Total increase needed=630 cells
Calculate the number of days needed:
Number of days = 
Number of days = 
= 3 days
Therefore, the correct answer is: 3 days
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
To solve the division problem 3 
÷ 2 
, follow these steps:
Convert the mixed numbers to improper fractions:
For 3 
:
3 
= 
= 
For 2 
:
2 
= 
= 
Divide the fractions by multiplying by the reciprocal:
÷ 
= 
× 
= 
= 
Convert 
to a mixed number:
93÷56=1remainder37
So the result of 3 
÷ 2 
is: 1 
Correct Answer is B
Explanation
To determine the new infusion time when the rate is 20% slower, follow these steps:
Find the original infusion time:
The original time is 45 minutes.
Calculate the 20% slower rate:
A 20% slower rate means the time will be increased by 20%.
20% of 45 minutes is: 0.20×45=9minutes
Add the extra time to the original time:
The new infusion time is: 45minutes + 9minutes =54minutes
Therefore, the nurse should infuse the medication over: 54 minutes
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