I think it was well written because the concept seems interesting in itself that people could go back in time or into the future. Albert Einstein has a better theory though
What where is the choice or they want a explanation
The first number is 40. The second, third, and fourth number each add 7, so we have 3 steps to get to the fourth step, so we must add 7 *3 = 21 to 40, which is 61.
