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 A
Explanation
To solve the expression 
- 
+ 
, follow these steps:
Find a common denominator:
The denominators are 3, 6, and 18.
The least common denominator (LCD) of 3, 6, and 18 is 18.
Convert each fraction to have the common denominator of 18:
= 
= 
= 
= 
isalreadyinthecorrectform.
Rewrite the expression with the common denominator:
– 
+ 
Combine the fractions:
– =
+ 
= 
= 
Therefore, the correct answer is: 
Correct Answer is B
Explanation
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:
Dailygrowthrate=7%=0.07
Calculate the daily increase in cells:
Dailyincrease=3000×0.07=210cellsperday
Determine the total increase needed:
Totalincreaseneeded=630cells
Calculate the number of days needed:
Numberofdays =
Numberofdays = = 3days
Therefore, the correct answer is: 3 days
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