Question

No 2 tolongin dong sama caranya ya makasih

Answer 1

1/5 + 1/x = 1/(3 1/3)
1/5 + 1/x = 1/(10/3)
1/5 + 1/x = 3/10
1/x = 3/10 - 1/5
1/x = 3/10 - 2/10
1/x = 1/10
x = 10

Pekerjaan itu selesai dalam 10 hari jika hanya dikerjakan Umar