Question

fie numere naturale a, b si c cu suma 460. Sa se afle cele 3 nr daca a si b sunt direct proportionale cu 3 si 4 , iar b reprezinta 25 % din c. DAU COROANA

Answer 1

a+b+c=460
a/b=3/4
b=25c/100
a=3b/4= 75c/400
75c/400+25c/100+c=460
575c=184000
C=320
B=80
A=60

Answer 2

a+b+c=460
(a,b,c)-dp->(3,4)
a/3 = k =3k
c/4 =k = 4k
3k+4k+c=460
7k+c= 460
k= 460:8
K=57,5
A= 57.5*3 = 172.5
C=230.5 (172.5+57.5)
B=25/100*230= 25/100*23( simplifici prin 5)5supra 1 *25= 5*25= 125
172.5+230+57.5= 460