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¼× 100m²= 25m²
• dipasang keramik
20% × 100m²= 20m²
• ditanami rumput
kolam ikan + yg dipsang keramik + ditanami rumput = sebidang tanah
=>25 + 20 + ditanami rumput = 100
=>ditanami rumput = 100-25-20
=> ditanami rumput = 55m²
jdikan jawaban terbaik ya:)