Question

Ana si Bogdan au impreuna 7 mere,iar Ana si Calin au impreuna 8 mere.Cate mere are ana stiind ca cei trei copii au impreuna 12 mere.

Answer 1

Ana...Bogdan...7 mere
Ana...Calin.....8 mere
_____________________
2Ana.......Calin......Bogdan.....15 mere
Ana.......Calin.......Bogdan.....12 mere
Ana........15-12=3
Ana.....3 mere
 Sper ca te-am ajutat

Answer 2

Ana + Bogdan = 7 mere
Ana + Calin =     8 mere
Ana + Bogdan +Calin = 12 mere
2 x Ana + Bogdan +Calin = 7+8 ( 15)
Ana + Bogdan +Calin =12
Ana = 15-12 
Ana = 3
Bogdan = 7-3
Bogdan = 4
Calin= 8-3
Calin = 5
Proba   3+4+5=12