Jibu hesabu yangu, wengi mtafeli hapo

Jibu hesabu yangu, wengi mtafeli hapo

Mtiririko upo hivi;

4 + 4 =4 x 5 = 20

5 + 5 = 5 x 6 = 30

6 + 6 = 6 x 7 = 42

7 + 7 = 7 x 8 = 56

Kwa hiyo,

9 + 9 = 9 x 10 = 90

Answer = 90
 
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