r +a +c = 785
r + a =509 kg
a + c = 388 kg
in loc de r +a punem valoarea de 509 si aflam cate kg de castraveti a cules
509 + c = 785
c = 785 - 509
c = 276 kg castraveti
cate kg de ardei a cules?
a + 276 = 388
a = 388 - 276
a = 112 kg
cate kg de rosii a cules?
r + a =509
r + 112 = 509
r = 397
verificam
397 + 112 + 276 = 509 + 276=785