Răspunsuri

2014-11-18T00:05:58+02:00
A - rinduri a cate 21 scaune, b - rinduri a cate 22 scaune
a+b=20, 21a+22b=428, a=20-b
21(20-b)+22b=428
420-21b+22b=428             
b=428-420
b=8
8 rinduri a cate 22 scaune
20-8=12
12 rinduri a cate 21 scaune
56 4 56