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15/2 + 9/4 ⇒ samakan penyebutnya
30/4 + 9/4 = 39/4m
karena dipakai membuat pintu, jadi :
39/4 - 7 3/5
39/4 - 38/5 ⇒ disamakan penyebutnya
195/20 - 152/20 = 43/20m atau 2 3/20
tambahan = 2 1/4= 9/4m
Total = 15/2 + 9/4
= 30/4 + 9/4
= 39/4
dipakai = 7 3/5 = 38/5m
sisa = total - dipakai
= 39/4 - 38/5
= 195/20 - 152/20
= 43/20 atau 2 3/20