Question

Aflati numerele a si b stiind ca sunt direct proportionale cu 2 si 3,iar a+b=25.

Answer 1

{ a,b } d.p { 2,3 }
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a + b = 25
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a / 2 = b / 3 = K

a / 2 = K => a = 2 K
b / 3 = K => b = 3 K

2 K + 3 K = 25
5 K = 25
K = 25 : 5
K = 5

a = 5 x 2 = 10

b = 5 x 3 = 15

Answer 2

a+b =25
a/2 =b/3

a/2+b/3 =a+b/2+3 =25/5 =5
a/2 =5 ;         a =2*5 =10
b/3 =5 ;          b =3*5 =15