Question

aflati x si y direct proportionale cu 13 si 24stiind ca media lor aritmetica este 92,5

Answer 1

{x,y}dp{13,24}
x/13=y/24=k
x/13=k⇒x=13k
y/24=k⇒y=24k
(x+y)/2=925/10
10(x+y)=925·2
x+y=1850/10
x+y=185
(13k+24k)=185
37k=185
k=185/37
k=5
x=13k=13·5
x=65
y=24k=24·5
y=120