Xiao Wang and Xiao Li are to process the same number of the same type of parts, and they start working at the same time. It is known that Xiao Wang processes 15 per hour, and must rest for 1 hour after every 2 hours of work; Xiao Li works without interruption, processing 12 per hour. As a result, they both finish at the same moment. Xiao Wang processes $\qquad$ parts.
【Analysis and Solution】
In the first 2 hours, Xiao Wang processed $15 \times 2=30$ pieces, and Xiao Li processed $12 \times 2=24$ pieces; in the first 3 hours, Xiao Wang processed $15 \times 2=30$ pieces, and Xiao Li processed $12 \times 3=36$ pieces; in the first 5 hours, Xiao Wang processed $15 \times 4=60$ pieces, and Xiao Li processed $12 \times 5=60$ pieces; after that, every 3 hours, Xiao Wang processed $15 \times 2=30$ pieces, and Xiao Li processed $12 \times 3=36$ pieces, and the number of pieces processed by Xiao Wang was always less than that processed by Xiao Li; since at a certain moment both completed their work simultaneously;
Therefore, Xiao Wang processed 60 pieces.