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y - chlopaki
x + y = 930
0,86x = y
1,86x = 930 x => 500 y = 430
y-dziewczyny
x+y=930
y=0.86x
rozwiązujemy układ równań
x+0.86x=930
y=0.86x
1.86x=930
y=0.86x
x=500
y=0.86*500
x=500
y=430
spr
500+430=930