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

Q: Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?

A: 30 %
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Q: Problem: line q has the equation 5 y – 3 x = 30 . if line s is perpendicular to q , has an integer for its y - intercept , and intersects q in the second quadrant , then how many possible line s ’ s exist ? ( note : intersections on one of the axes do not count . )

A: 22
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Q: Problem: a train 110 m long is running with a speed of 82 km / hr . in what time will it pass a man who is running at 6 km / hr in the direction opposite to that in which the train is going ?

A:
4.5 sec
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