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11×18=198m²
1m²-20g
198m²-x g
..............
x=198×20
x=3960g
potrzeba 3960g, czyli
3960:100=3,96kg nawozu
198m²×20g=3960g
3960÷1000=3,96kg
odp: potrzeba 3,96 kilograma nawozu.