Question

In trei rezervatii traiesc 980 de animale.Aflati cate animale traiesc in fiecare,stiind ca in primele doua traiesc 640,iar in a treia cu 35 mai multe decat in prima rezervatie.

Answer 1

a+b+c=980, 640+c=980, c=980-640, c=340

a+b=640, 305+b=640, b=640-305, b=335

c=a+35, 340=a+35, a+35=340, a=340-35, a=305

Answer 2

a+b+c=980

 640+c=980

 c=980-640

c=340

a+b=640

305+b=640

b=640-305, b=335

c=a+35

340=a+35

a+35=340

a=340-35

a=305