5. Ania,Basia i Celina zbierają autografy sławnych ludzi. Ania ma o 40% więcej niż Basia, Ale o 40% Mniej niż Celina. Celina zebrała już 70 autografów. Ile autografów ma Ania, a ile Basia ~~~~> Dam N.A.J <~~~~
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C - Celina
B - Basia
A - Ania
C = 70
A = 100% - 40% = 60% z C
A = 0,6 * 70 = 42
B = 42 : 1,4 = 30
x-ania x=1,4y x=0,6z
y-basia y=x/1,4=42/1,4=30
z-celina z=70
0,6z=x
x=0.6*70=42 autografy