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(2*22,3+2*15,75)*2=152,2m
2) x - zeszyty
y - książki
5x+5y=7,5
10x+y=9,90 --> y=9,90-10x
5x+5(9,90-10x)=7,5
5x+49,5-50x=7,5
-45x=-42
45x=42
x=42/45 ~0,93 zł
y=9,90-9,30
y=0,60
3) 3000-1200=1800
(1800/3000)*100=60%
4) 3/8ha=105/2
3ha=420
ha=140
140*0,8=112
5) 27/10m=864 zł
27m=8640
m=320
3,2*320=1024
6) x-matka
y- córka
x+y=50
x=y+24
y+24+y=50
2y=26
y=13