Question

ana si bogdan su impreuna 7 mere, iar ana si calin au impreuna 8 mere.
determinati cate mere are ana ,stiind ca, impreuna , cei 3 copii au 12 mere

Answer 1

a- Ana ,b- Bogdan , c- Calin a+b=7mere a+c=8 mere a+b+c=12 mere 7+c=12 c=12-7 c=5 mere 8+b=12 b=12-8 b=4mere a+b=7 a=7-4 a=3 mere Deci Ana are 3 mere ! Sper ca te-am ajutat! :)

Answer 2

ana = a
bogdan = b
calina = c
-----------------------
a+b=7 mere
b+c=8 mere
a+b+c= 12 mere

---------------------

(a+b+c)-(a+b)= c
c= 12- 7
c= 5 mere

-----------
(a+b+c)-(b+c)= a
a=12-8
a=4  mere

-----------

(a+b+c) - (a+c) = b
a+c= 5+4=9
12 - 9 = 3 mere
b = 3 mere