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1.½X
2.⅓X
3.50
½X+⅓X+50=X
3/6X+2/6X+50=X
5/6X+50=X
5/6X-X=-50
-1/6X=-50 /(-1/6)
X=300-długość całego ogrodzenia
1.½×300=150
2.⅓×300=100
3.50