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Verified answer
Dinding pasir 25% = 1/4 bagian=1 - (1/4 + 1/8 + 1/6 )
=1 - (6/24 + 3/24 + 4/24)
=1 - 13/24
=24/24 - 13/24
=11/24
banyak material adalah 11/24 bagian