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A simple math problem needs to be explained in detail and easy to understand.
Analysis: According to "the number of participants in the volleyball team is 15, which is 3/4 of the number of participants in the table tennis team", the number of participants in the table tennis team is "1" and "what is the score of a number", that is, what is the score of a number? Now, according to "3/4 of the participants in the table tennis team are 65,438"

Auxiliary line diagram:

|-Table tennis team? People-|

|_____|_____|_____|_____|

|-The volleyball team has 15 people-|.

Solution: 15÷( 1-3/4)=20 (person)

There are 20 people on the table tennis team.