Teachers and parrents

Instructions:

Insert numbers into empty fields in triangle (grape). The sum of two neighbouring numbers in one row must be equal to number below those fields. You may use only "pranskters" - numbers, which are known and located below triangle (grape).

Example

30
20
1
7
  
8
  
21
  
29
  
50
  
71
  
100
  

Solution

30
20
1
7
50
21
8
71
29
100

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