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calculati suma nr;20si35;31si37;42si24;68si11;53si46;75si21;86si13;97si2;64si15.

Răspuns :

20 +35= 55 , 31 +37= 68 , 42 + 24 =66 , 68 +11 =79 , 53 +46 = 99 , 75 +21 = 96 , 86 +13= 99 , 97 + 2 = 99 , 64+ 15 =79 
Ramona19852007ask
20+35=55    31+37=68   42+24=66   68+11=79   53+46=99     75+21=96    86+13=99  97+2=99    64+15=79                    55+68+66+79+99+96+99+99+79=740

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