exam Maths Puzzle Numerical Ability

the answer i have is not corresponding with the answer im getting could you please not e-mail me just the answer but show me how to work it out.

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I need to know what 3 dimensional solid has a vertical cross section that is a retangel and a horizontal crosssection that is a circle. I need the name and picture. Thank you for your help Two people with flu visit a campus. The number of days T it took for the flu viruses to infect n people is given by: T=-1.43Ln(10,000-n/4998n)

how many days will it take to infect 500 people?

Sorry, not from a text

Thanks in advance