Steven has run a certain number of laps around a track at an average (arithmetic mean) time per lap of 51 seconds. If he

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Source: Princeton Review

Steven has run a certain number of laps around a track at an average (arithmetic mean) time per lap of 51 seconds. If he runs one additional lap in 39 seconds and reduces his average time per lap to 49 seconds, how many laps did he run at an average time per lap of 51 seconds?

A. 2
B. 5
C. 6
D. 10
E. 12

The OA is B