Question

aflați 3 numere știind că sunt direct proporționale știind numerele 15,28,40,iar suma lor este 249

Answer 1

{ a,b,c } d.p ( direct proportionale ) { 15,28,40 }
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a + b + c = 249
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a / 15 = b  / 28 = c  / 40 = K

a / 15 = K => a = 15 K
b  / 28 = K => b = 28 K
c / 40 = K => c = 40 K

15 K + 28 K + 40 K = 249
43 K + 40 K = 249
83 K = 249
K = 249 : 83
K = 3

a = 3 x 15 = 45

b = 3 x 28 = 84

c = 3 x 40 = 120 

Answer 2

{a, b, c} do{15,28,40}
a+b+c=249
a/15=b/28=c/40=k
a=15k
b=28k
c=40k
15k+28k+40k=249
83k=249
k=249:83
k=3
a=15k=15×3=45
b=28k=28×3=84
c=40k=40×3=120