exam Maths Puzzle Numerical Ability

a cell takes 8 hours to divide once. How many hours will it take to divide atleast in to 100 cells

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exam Other Question

I am trying to complete the square for this equation
x^2=5x+2
Options on my test are
a.)5+sqrt20/2
b.)5+sqrt29/4
c.)5+sqrt33/4
d.)5+sqrt33/2
I am not even close to any of these options. please help Find four consecutive integers such that twice the first subtracted from the sum of the other three integers is sixteen.