Question

doua numere sunt direct proportionale cu 5 si 2 .Aflati cele douan numere stiind ca suma lor este 147

Answer 1

a= primul nr
b= al doilea nr
a+b= 147
(a,b) d.p ( 5 , 2)
a/5=b/2=k
a/5=k => a=5·K
b/2=k => b=2·K
5k+2k=147
7k=147
k=147:7
k=21
a= 5·21=105
b=2·21= 42

Answer 2

{ a,b } d.p { 5,2 }
-------------------/----------
a+b = 147
-----------------------//-------

a / 5 = b / 2 = K

a / 5 = K => a = 5 K

b / 2 = K => b = 2 K

5 K + 2 K = 147

7 K = 147

K = 147 : 7

K = 21

a = 21 x 5 = 105

b = 21 x 2 = 42