If you remove the six giant pandas, there will be so many red pandas, totaling ***20-6= 14, and each 14/2=7. If six giant pandas are brought back, there are 7+6= 13 giant pandas, so there are 13 giant pandas.

(In the third grade, you can also ask six little pandas to help you with the calculation, but in the second grade, you didn't learn the division of 26/2, so you can only use the former method. )

Let's assume that there are 2 red pandas and 2+6=8 giant pandas, making a total of 2+8= 10 pandas. In fact, there are 20 pandas in total, which is 20- 10= 10 more than the hypothesis, which means that there are more pandas 10.

(However, this method of assuming a known number first is estimated that most people are not used to it and will not be used reasonably. )