Odpowiedź :
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.
a - Ania
b - Basia
c - Celina
c=70
a = 0.6c = 0.6 * 70 = 42 - ilość autografów Ani
a=1.4b ==> b = a/1.4 = 42/1.4 = 30 - ilość autografów Basi
Odp. Celina ma 70 autografów, Ania 42, a Basia 30.