Question

Cu cat este mai mare y decat x daca intre multimile {x+8;28;y} si {x;12;18} se stabileste o proportionalitate directa?

Answer 1

adica (x+8) / x  = 28/12  =18/y  =>

=>18/y =28/12 (=7/3)  =>18*3=y*7 <=> y=54/7
=> (x+8) / x  =7/3 => (x+8) *3 =x*7 <=> 3*x+24=7*x <=>
<=>24=4*x <=>x=6 (=42/7)  =>
=> y-x =54/7-42/7 =12/7