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Verified answer
JawabLama pekerjaan
Ana = A
Ina = B
Ani = C
bersama sama = 4 hari
1/T = 1/12 + 1/20 + 1/30
1/T = 1/6
bersama sama selesai dalam 6 hari
sudah kerjakan = 4hari
sisa waktu = 2 hari
sisa pekerjaan =2/6 = 1/3 bagian
dikejakan oleh Ani selama = 1/3 : 1/30 = 10 hari