Question

Suma numerelor x si y este 20 si multimea (x ; y ) este invers proportionala cu ( 0,25 ; 0,(3) ). Determinati numerele . Va rooogg !!! Ajutati-ma

Answer 1

x+y=20
0,25x=0,(3)y=y/3=>y=0,75x
=>x+0,75x=20
x=20/1,75
x=400/35=80/7=>y=60/7

Answer 2

x+y=20
0,25=1/4
0,(3)=3/9=1/3
x/1/4=y/1/3=k
x/1/4=k
x/4=k=> x=4k
y/3=k =>y=3 k
0,25x=
Inlocuim
x+y=20
4k+3k=20
7k=20
k=20/7
x=4k
x=4 ori20/7
x=80/7
y=3 ori 20/7
y=60/7
80/7+60/7=140/7=20