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sebidang tanah = 100%
kedelai
= 30/100 x 100%
= 30
jagung
= 3/5 x 100
= 3 x 20
= 60
sisanya
= 100 - (kedelai + jagung)
= 100 - (30 + 60)
= 100 - 90
= 10
maka yg dipakai untuk padi hanya seluas 10
30% = kedelai
3/5 = 3/5×20 = 60/100 = 60% = jagung
cara:
100% - ( 30% + 60% ) =
100% - 90% = 10%
jadi 10 % digunakan untuk menanam padi :))
kemungkinan seprti itu karena tidak ada luasnya jadi susah jawabnya