instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if a speaks the truth 40 % of the times , b speaks the truth 80 % of the times . what is the probability that at least one will tell the truth
answer:
0.12


question:
Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
answer:
180 meter


question:
Problem: what is next no . 11 23 47 83 131 191 263 347 443 551 ? ? ?
answer:

67