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3 1/6 + 4½ - 5 7/9 =19/6 + 19/2 - 52/9
=57/18 + 171/18 - 104/18
=228/18 - 104/18
=124/18
=6 16/18
=6 8/9
No.2
Waktu awal /
waktu yang diinginkan ×
banyak pekerja
90/25 × 5
= 90 : 5
= 18
Banyak pekerja yang ditambahkan = 18 - banyak pekerja sebelumnya = 18 - 5
18 - 5 = 13
Maaf banget jika salah , semoga bermanfaat...