Va rog repede Problema 23
DAU coroana

a+b+c =77
a =4c ; c =a/4
b =a+5
a + a+5 + a/4 =77 numitor 4
4a+4a+20+a =308
9a =308-20
9a =288
a =32
b =a+5 =32+5 =37
c =a/4 =32/4 =8