Can you hellp me please

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.

Ok what do you need with

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst. 

+10 that is always the common denominator