Mr. and Mrs. Doran have a genetic history such that the probability that a child being born to them with a certain trait is 30%. If they have four children, what is the
probability that at most two of their four children will have that trait? Round your
answer to the nearest thousandth.

Track A has 155000 seats and track B has 61000 seats.

Explanation

Suppose, the number of seats at race track B is  

As race track A has 33000 more seats than twice the number of seats at track B, so the number of seats at track A will be:

Given that, the total number of seats in two tracks is 216000. So, the equation will be....

So, the number of seats at track B is 61000 and the number of seats at track A