Răspuns:
10. a+b+c+d= 22 soldatei ( a,b, c ,d cei 4 frati)
b= 4*d a= 3*c c-d= a-b c-d = 3c-4d 4d-d =3c-c 3d=2c d= 2c/3
b= 4*2c/3=8c/3
3c+8c/3 +c+ 2c/3= 22 ( aducem la acelasi numitor 3 )
9c+8c+3c+2c= 66 12c+10c=66 22c=66 c= 66:22= 3 c=3 soldati
a= 3*3= 9 a= 9 soldati
d= 2*3:3= 6:3=2 d= 2 soldati
b= 8*3:3 = 8*1=8 b=8 soldati
verificare :9+8+3+2 = 17+5=22 soldati
11. Ma= (a+b+c):3 a+b+c= 22*3= 66 a+b+c=66
(a+b):2= 22 a+b= 22*2 = 44 a+b=44
a= b+20 44+c=66 c= 66-44=22 c= 22
b+20+b=44 2b=44-20= 24 2b=24 b= 24:2= 12
b=12 a= 12+20 = 32 a= 32
