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52 is Correct!  You must have figured out how tables work.  By tracking the Trip column down to 4 and across the row until it intersected the Styrofoam column (all highlighted below), you can find out that 52 is the number of styrofoam pieces that the 4th trip collected.

Trip Plastic Glass Styrofoam Cigarettes
1 43 11 38 139
2 108 5 59 314
3 55 5 24 122
4 69 7 52 167
5 174 3 100 504

Good job.  Now we'll take this data to the next step by
Graphing It!

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