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

[Q]: Problem: a fair 2 sided coin is flipped 4 times . what is the probability that tails will be the result at least twice , but not more than 4 times ?
[A]: 5 / 8


[Q]: Problem: the population of a city is 415600 . it increased by 25 % in the first year and decreased by 30 % in the second year . what is the population of the city at the end of second year ?
[A]: 363650


[Q]: Problem: the grade point average of one third of the classroom is 15 ; the grade point average of the rest is 18 . what is the grade point average of the whole class ?
[A]:
17