Question

Numerele xsi y sunt direct proportionale cu 5si4 aflati numerele stiind ca x+y=4100

Answer 1

Numerele x si y sunt direct proportionale cu 5 si 4 ⇒ x/5 = y/4 = k ⇒ x=5k si y=4k dar x+y=4100 ⇒ 5k + 4k = 4100  9k = 4100 k = 4100/9              
⇒ x=5k = 5×4100/9 = 20500/9  si y=4k= 4×4100/9 = 16400/9

Answer 2

x/5=y/4=k
x+y=4100
x/5=k=>x=5k
y/4=k=>y=4k
5k+4k=4100
9k=4100
K=4100/9
4100•5/9=x=>x =20500/9
y=4100•4/9=>y=16400/9