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= 7,5 L
= (7,5 x 1.000) mL
= 7.500 mL
utk minum keluarga
= 3/5 x 7,5 L
= 3 x 1,5 L
= 4,5 L
= (4,5 x 1.000) mL
= 4.500 mL
jadi, sisa air yg masih ada
= 7.500 mL - 4.500 mL
= 3.000 mL