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80 butir tadi 0 nya dihilangkan kemudian dikalikan 3
=8 x 3
=24 butir
nyari kelereng danu:
=8 x 7
=56
pembuktian perbandigan:
24/56
=3/7
nb:perbandingannya dibagi 8
pembuktian jumlah:
24 + 56
=80