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 C
Explanation
Let's evaluate each statement:
120% = 1.02:
To convert 120% to a decimal: 120%=1.20120\% = 1.20120%=1.20.
This statement is incorrect because 120% equals 1.20, not 1.02.
45% = 0.045:
To convert 45% to a decimal: 45%=0.4545\% = 0.4545%=0.45.
This statement is incorrect because 45% equals 0.45, not 0.045.
0.005 = 0.5%:
To convert 0.005 to a percentage: 0.005×100=0.5%0.005 \times 100 = 0.5\%0.005×100=0.5%.
This statement is correct.
DCLXVI = 650:
In Roman numerals: D = 500, C = 100, L = 50, X = 10, V = 5, I = 1.
Adding these: 500+100+50+10+5+1=666500 + 100 + 50 + 10 + 5 + 1 = 666500+100+50+10+5+1=666.
This statement is incorrect because DCLXVI equals 666, not 650.
The correct statement is: 0.005 = 0.5%
Correct Answer is D
Explanation
To determine which number is proportional to 19, we need to identify which option represents the same ratio or value as 19.
190%:
Convert 190% to a decimal: 190% = 
= 1.91
19 is not proportional to 1.9. Therefore, the option is not correct.
4.76:
Compare 19 to 4.76: 19isnotproportionalto4.76. Therefore, the option is not correct.
:
Simplify 
: 
= 
Compare 19 to 
: 19isnotproportionalto
. Therefore, the option is not correct.
:
Simplify 
: 
=19
19 is proportional to 19. Therefore, the option is not correct.
Therefore, the correct answer is 
.
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