instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: a 270 metres long bullet train running at the speed of 120 kmph crosses another bullet train running in opposite direction at the speed of 80 kmph in 9 seconds . what is the length of the other bullet train ?
answer:
230


question:
Problem: the mean daily profit made by a shopkeeper in a month of 30 days was rs . 350 . if the mean profit for the first fifteen days was rs . 255 , then the mean profit for the last 15 days would be
answer:
rs . 445


question:
Problem: if the selling price of 60 articles is equal to the cost price of 30 articles , then the loss or gain percent is :
answer:

50