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1b-y
{x+y=67
{0.6x+0.75y=45
{x=67-y
{0,6(67-y)+0,75y=45
{x=67-y
{40,2-0,6y+0,75y=45
{x=67-y
{0,15y=4,8/0,15
{x=67-y
{y=32
{x=67-32
{y=32
x=35
y=32
odp. W klasie 1a jest 35 uczniów a w klasie 1b jest 32 uczniów.