The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: the probability is 1 / 2 that a certain coin turns up heads on any given toss . if the coin is tossed 6 times , what is the probability that the coin turns up tails on at least one of the tosses ?
[EX A]: 63 / 64

[EX Q]: Problem: 60 is to be divided into two parts such that the sum of 10 times the first and 22 times the second is 780 . the bigger part is :
[EX A]: 45

[EX Q]: Problem: if the average of 20 digits is 500 and the average of 14 of them is 390 , calculate the average of the remaining 6 numbers ?
[EX A]:
756.7