3. There are 20 students standing in a row. If they count off every other person from left to right, Xiao Li reports number 8; if they count off every third person from right to left, Xiao Chen reports number 6. Then, starting from Xiao Chen and counting to Xiao Li, the number Xiao Li reports is ( ).
(A) 11
(B) 12
(C) 13
(D) 14
3.A.

Solution 1: According to the problem, Xiao Li is in the 2 × 7 + 1 = 15th position from left to right in the queue, and Xiao Chen is in the 3 × 5 + 1 = 16th position from right to left, which is the 20 - 16 + 1 = 5th position from left to right. As shown in Figure 3.
Figure 3
Therefore, starting from Xiao Chen and counting each person to Xiao Li, the number Xiao Li reports is 15 - 5 + 1 = 11.

Solution 2: According to the problem, Xiao Li is in the 2 × 8 - 1 = 15th position from left to right in the queue, and Xiao Chen is in the 3 × 6 - 2 = 16th position from right to left. As shown in Figure 4.

Therefore, starting from Xiao Chen and counting each person to Xiao Li, the number Xiao Li reports is (15 + 16) - 20 = 11.