tolong bantu saya,pleaseeeeee.help nomor 2 aja kak

20 x 30 / 20 + 30 = 600 / 50 = 12 hari

Andi = 20 hari
Soni = 30 hari

1/20+1/30
= 30+20/600
= 50/600
= 600/50 (dibalik)
= 12 hari