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y-liczba chłopców
x+y=26
1/2y=4/5x
x=26-y
1/2y=4/5(26-y) |10
5y=8(26-y)
5y=208-8y
13y=208
y=16
x=26-16=10
Odp. Dziewczyn jest 10, a chłopców 16