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70-40%= 42- Ania
42-40%=30-Basia
basia- o 40% mniej niż basia
celina-70 autografów
70-100%
x-60%
60*70/100=42 autografy Ani
70-100%
x-20% (20% bo, o 80 % mniej niż Celina)
20 * 70/ 100 = 14 autografow Basi
odp. BAsia ma 14 autografow, a ania 42.
x - 40 %
70×40 = 100x
2800 = 100x | :100
28 = x
40% = 28 (x )
70 - 28 = 42 ( Basia )
Ania - 42 autografy - 100 %
x - 40 %
42×40 = 100x
1680 = 100 x |:100
16.8 = x
40 % = 16 ( w przybliżeniu )
42 + 16 = 58 ( Ania )