70 - Celina
70-40%*70=70-0,4*70=70-28=42 - Ania 40% mniej niż Celina
x - ilość Basi
140%x=42
1,4x=42
x=42/1,4
x=30
Basia ma 30, a Ania 42 autografy
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70 - Celina
70-40%*70=70-0,4*70=70-28=42 - Ania 40% mniej niż Celina
x - ilość Basi
140%x=42
1,4x=42
x=42/1,4
x=30
Basia ma 30, a Ania 42 autografy