11. Wang Hua learns calligraphy every Tuesday and Saturday. It is known that January 1, 2016, was a Friday. Therefore, in August 2016, the number of days Wang Hua learned calligraphy is $\qquad$ .
【Analysis】First, analyze the day of the week from January 1, 2016, to August 1. Calculate the number of days and check the remainder. Enumerate the calligraphy dates in August.

【Solution】According to the problem:
The number of days in the first seven months of 2016 is $31+29+31+30+31+30+31=213$ (days);
$$
213 \div 7=30 \cdots 3 \text {. }
$$

Therefore, August 1 is a Monday. August has 31 days, with 8 days in 4 weeks, and the last day is a Tuesday, making a total of 9 days.

So the answer is: 9