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A = 2K
S + A + K = 54
1,5*2K + 2K + K = 54
6K = 54
K = 9
A = 2K = 2*9 = 18
S = 1,5A = 1,5*18 = 27
Odp. Staszek ma 27 lat, Ania 18, a Kasia 9.
2x-Ania
1,5(2x)-Staszek
54-razem
x+2x+3x=54
6x=54 /:6
x=9
1,5(2x)=3x=3*9=27
odp. Staszek ma 27 lat
x - wiek Staszka
y - wiek Anii
z - wiek Kasii
x + y + z = 54
x = 1,5y
z = 0,5y
1,5y +y + 0,5y = 54
x = 1,5y
z = 0,5y
3y = 54
x = 1,5y
z = 0,5y
y = 18
x = 1,5y
z = 0,5y
y = 18
x = 27
z = 9
Odp: Staszek ma 27 lat.