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y=x-40%x=60%x-cena drugiego zeszytu
x+y=14
x+0,6x=14
1,6x=14
x=8,75
y=14-8,75=5,25
całość-14 zł
II zeszyt-x
I zeszyt-x-⅖(40% to ⅖)
x+x-⅖=14
2x-⅖=14
2x=14-⅖
2x=13 3/5
x=6,65
6,65=6 65/100
⅖=40/100
6 65/100-40/100=6 25/100
6 25/100=6,25