Question

costel si andreea au in biblioteca lor 289 de carti.Cite carti are fiecare copil stiind ca andreea are cu 43 de carti mai mult?

Answer 1

289-43=246 246:2=123 un copil 123+43=166(Andreea) Proba123+166=289

Answer 2

C= cartile lui Coste;
A= cartile Andreei
C+A= 289
A=43+C
C= A-43
A+C=289
43+C+A-43=289
43+C+43+C-43=289
43+2C=289
2C=289:43
2C=6.7209
C=6,7209:2
C=3.036045
A= 43+C
A= 43+3.036045
A= 46,036045