James has 3 fish tanks. 1 of the tanks has 20 fish in it and the other two have twice as many fish each as the first. How many total fish do they have? Let's be accurate as possible.
The second and third tank each have 20 * 2 = 40 fish. So in total there are 20 + 40 * 2 = 100 fish.
The answer: 100.