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 D
Explanation
To convert 0.072 to a percentage and a fraction:
Percentage:
0.072×100=7.2%
So, 0.072 is equal to 7.2%, hence the option of 72% is incorrect.
Fraction:
So, 0.072 is equal to 
, hence the option of 
is incorrect.
Percentage:
0.072×100=7.2%
So, 0.072 is equal to 7.2%, hence the option of 0.72% is correct.
Fraction:
0.072 = 
So, 0.072 is equal to 
, hence the option of 
is correct
Correct Answer is B
Explanation
Let's evaluate each statement to determine which one is true:
= 
:
To check if these fractions are equal, cross-multiply:
5 × 10 = 50
6 × 9 = 54
Since 50≠54, 
≠ 
. This statement is false.
= 
:
To check if these fractions are equal, cross-multiply:
321 × 112 = 35,952
336 × 107 = 35,952
Since 35,952 = 35,952, 
= 
. This statement is true.
= 
:
To check if these fractions are equal, cross-multiply:
8 × 8 = 64
12 × 3 = 36
Since 54 ≠ 36, 812
≠ 38
. This statement is false.
= 4 
:
Convert 4 
to an improper fraction:
4 
= 
= 
=
To check if these fractions are equal, cross-multiply:
19 × 2 = 38
4 × 9 = 36
Since 38 ≠ 36, 
= 4 
. This statement is false.
Therefore, the correct statement is: 
= 
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