Team A has an average score of 82 over 10 games. Team B has an average score of 78 over 15 games. By how much does Team A's average exceed…

The question compares the two averages directly, so no weighting by the number of games is needed. Team A's average exceeds Team B's by $82-78=4$, choice B. The numbers of games (10 and 15) would matter only if the question asked for a combined average of both teams. Choice A ($2$) subtracts incorrectly. Choice C ($5$) is the difference between the numbers of games. Choice D ($8$) is the difference $82-74$, or twice the correct difference. Be careful to answer what is asked and ignore irrelevant details.