rizztastic maf problems

1. Mr Beast has two populations of yeast. The first population starts with 9 yeast and doubles every 3 hours, while the second population starts with 36 yeast and doubles every 4.5 hours. In how many hours will the number of yeast in the populations be equal, and how many yeast would there be in total?

2. Mr Beast is making burgers, but Fanum keeps taxing him! Every time Fanum taxes Mr Beast, Mr Beast loses 10% of all the burgers he has. If Mr Beast had 2400 burgers at the start, how many times will Fanum have to tax him until Mr Beast has less than 800 burgers?

3. Mr Beast decides to do a charitable challenge! Mr Beast considers the squares of an 8x8 chessboard. On the first square, he places 1 grain of rice. On the second square, he places 2 grains of rice, then 4, etc... How many grains of rice does he place on the board in total?

4. That was too easy for Mr Beast. This time, Mr Beast takes a 5x5 chessboard. On the first square, he places 1 grains of rice. On the second square he places 2. On the third he places 4, etc...
Mr Beast only has 60 million grains of rice. Can he complete this challenge?

5. Mr Beast and Mark Rober compete to be the most charitable! Now, every day, they start donating burgers. Mr Beast donates 500 burgers every day. Mark Rober donates 1 burger on the first day, 2 on the second day, etc... and n on the nth day. On what day does Mark Rober donate more burgers in total than Mr Beast?

Muh Name Bwe Tewwye

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