Entry no. 2

4. Try to make a total of 23 using exactly these 4 numbers: 3, 3, 7 and 7. You can use only +, -, and ( ).

5. Find the next term of this sequence:

1
11
21
1211
111221
312211
... ?

6. How can a gardener plant four plants in equal distance one from all another?

Good Luck!
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