2. (8 points) Xiao Zhang has 200 pencils, and Xiao Li has 20 fountain pens. Each time Xiao Zhang gives Xiao Li 6 pencils, Xiao Li gives Xiao Zhang 1 fountain pen in return. After $\qquad$ such exchanges, the number of pencils Xiao Zhang has is 11 times the number of fountain pens Xiao Li has.
【Answer】Solution: According to the problem, we have:
After the first time, Xiao Zhang has 194 pencils left, and Xiao Li has 19 pens left.
After the second time, Xiao Zhang has 188 pencils left, and Xiao Li has 18 pens left.
After the third time, Xiao Zhang has 182 pencils left, and Xiao Li has 17 pens left.
After the fourth time, Xiao Zhang has 176 pencils left, and Xiao Li has 16 pens left, which is exactly 11 times.
Therefore, the answer is: four