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8l = 8dm³ = 8000 cm³
( 2/1000)*8000cm³ = 16 cm³
b)20 g -ile to promili masy 5 kg?
5kg = 5000g
20 g = x ‰
5000 g = 1000‰
x ‰ =[ (20g)*1000‰ ] : 5000g = 4 ‰
c)6 arów to 15 ‰ powierzchni pewnego pola.Ile hektarów ma to pole ?
6a = 15‰
x = 1000‰
x = (6a*1000‰ ) : 15‰
x = 400 a
1ha = 100a
x = 400a :100 = 4 ha