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y - dz.
{x+y = 930
{y=85%x
{x+85%x=1,85x
{1,85x = 930 / 1,85
x= 502
y= 428
85%x to dziewczyny = 0,85x
x to chłopcy
0,85x +x = 930
1,85x = 930
x = 503
0,85x = 0.85 *503 = 427
dziwoi jest 427 a boys 503