How many whole minutes does it take 10000 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