Odpowiedzi

2010-04-06T14:19:55+02:00
X-roz bialych
Y-roz czerwonych

X+Y=75
0,2X+0,25Y=17

X=75-Y
0,2(75-Y)+0,25Y=17

X=75-Y
15-0,2Y+0,25Y=17

X=75-Y
0,05Y=2

X=75-Y
Y=40

X=35
Y=40
2010-04-06T14:28:02+02:00
X - róże białe = 35
y - róże czerwone = 40

x+y=75
20%x+25%y=17

x+y=75
20/100x+25/100y=17

x+y=75
1/5x+1/4y=17

x=75-y
1/5*(75-y)+1/4y=17

x=75-y
15-1/5y+1/4y=17

x=75-y
15-4/20y+5/20y=17

x=75-y
1/20y=17-15

x=75-y
1/20y=2 /*20

x=75-y
y=40

x=75-40
y=40

x=35
y=40