I need that you solve this word problem in elimination method or any

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

How many times larger is 6 × 10^12 than 2 × 10^7? a. 30,000 b. 3,000 c. 3,000,000 d. 300,000

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?