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Level 3: 10 points:

Level 3: 10 points David has 3 blue balls and 4 black balls. Derrick has 4 blue balls and 3 black balls. Daniel bought David 4 red balls and 3 black balls and bought Derrick 2 blue balls. Daniel himself has only 5 blue balls. David gave Daniel 1 blue ball in return and Derrick gave Daniel 2 blue balls in return. How many blue balls did David and Derrick have in the end respectively?

Level 1: 2 points:

Level 1: 2 points 1+3+5-2+8-7 = ?

Level 2: 6 points:

Level 2: 6 points Memorize as much details as you can in the following picture.

Level 2: 6 points:

Level 2: 6 points Arrange the shape from the one with the smallest number to the one with the largest number in it. 1 14 -20 -9 7

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