Zad.1 Ania Basia i Celina zbierają maskotki. Ania ma o 40 % więcej niż Basia ale o 40 % mniej niż Celina. Celina ma 70 maskotek. Ile maskotek ma Ania i Basia?
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Ania----70 - 40% * 70 = 70 - 0,4*70 = 70 - 28 = 42
Basia-----
140%----42
100% ---x
x = 100*42 : 140 = 4200 : 140 = 30
Celina----70
odp. Ania ma 42 autografy a Basia 30.