A chocolate factory makes 89 pieces of chocolate each day. About how many pieces of chocolate will the factory make in 69 days? Choose the better estimate.

Three classes will go to the book fair in Qujing. The first class will arrive at the book fair at the time shown on the clock below:

Each class will spend 30 minutes at the book fair and then leave. The second class arrives at the book fair after the first class leave, and the third class will arrive after the second class leave. At what time will the third class leave the book fair?

On her 10^{th} birthday, Shan decided to distribute candies in her class of 57 students. Her mom gave her 829 candies to distribute. If she distributed candies equally in the class, how many candies did each student get and how many candies are left with Shan?

A water storage tank is filled with 21 l of water. On the first day of the week, 10 l 441 ml was used. On the next day, 6 l 847 ml was used. How much water is left in the tank?