exam Maths Puzzle Numerical Ability

1) Rosa Quezada is reimbursed when she uses her own car in her work as a sales representative for Logos Publishing. She is repaid for all tolls, she gets $0.40 per mile that she dr

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Batman can clean up all of the crime in Gotham city in 8hr working alone. Robin can do the same job alone in 12hr. If Robin starts crime fighting at 8 A.M. and Batman joins him at 10 A.M.. then at what time will they have all of the crime cleaned up? Yesterday I submitted this problem;however,forgot to include e.
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the number of bacteria present in a culture after t minutes as B=100e^kt If there are 6231 bacteria present after 11 minutes, find k.