Question

Aflati numerele a,b,c , stiind ca sunt direct proportionale cu 2, 5 si 8 iar 3a + 5b- 2c =30

Answer 1

 a     b      c
--- = --- = --- = k  si 3a+5b-2c=30
 2     5      8

a=2k; b=5k; c=8k
3(2k)+5(5k)-2(8k)=30
6k+25k-16k=30
15k=30 => k=2

a=2k=2*2=4
b=5k=5*2=10
c=8k=8*2=16

Answer 2

a, b, c, ------=--------=--------=k si 3a+5b-2c=30
2 5 8.
3(2k)+5(5k)-2(8k)=30
6k+25k-16k=30
15k=30=>k=2
a=2k=2*2=4
b=5k=5*2=10