Răspuns:
Daca s au consumat 45% caramizi
100.......45
30000.....x
x=13.500 consumate
30000-13500=16500 ramase
Daca s au consumat 20% scanduri insemna ca 80% au ramas
100.....80
5000....y
y=4000 ramanse
Daca s au consumat 30% saci ciment insemna 70% au ramas
100....70
1000....z
z=700 saci ramasi
Explicație pas cu pas: