Question

impartiti numarul 120 in aprti direct proportionale respect cu numerele 5 7 18

Answer 1

Fie a+b+c=120 
=>a=5k
   
b=7k
 
c=18k

5k+7k+18k=120

30k=120

k=4

Inlocuim si obtinem:

a=5*4=20

b=7*4=28

c=18*4=72

Deci, partile sunt 20, 28 si 72

Answer 2

{ a,b,c } d.p { 5,7,18 }
---------------------------/---------
a + b + c = 120
-------------------------//-----------

a / 5 = b / 7 = c / 18 = K

a / 5 = K => a = 5 K
b / 7 = K => b = 7 K
c / 18 = K => c = 18 K

5 K + 7 K + 18 K = 120
12 K + 18 K = 120
30 K = 120
K = 120 : 30
K = 4

a = 4 x 5 = 20

b = 4 x 7 = 28

c = 4 x 18  = 72