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y - masa
{x*y =24zł
{(x+4)*y = 30zł
{y = 24/x
{(x+4)24/x = 30
{y = 24/x
{24x+96 =30x
{y = 24/x
{6x=96
{y = 24/x
{x=16
y = 1,5 kg
x = 16zł
Pozdrawiam! :)