How many whole minutes does it take 1 viruses to grow to 1 million if their population doubles every 15 minutes?

Let's solve how many whole minutes does it take 10 000 viruses to grow to 1 million if their population doubles every 15 minutes.
=> 10 000 x n = 1 000 000 
=> 1 000 000 / 10 000 = 100 times 
=> 100 times * 15 minutes = 1500 minutes to make 1 million viruses

10 will be the number of adult tickets and 11 will be the number of children tickets. i hope i could ! good luck : )