20-21 pakai cara ya plis..

20).Umi
=4j 50m 15d
=3j 35m 59d
__________ +
8j 26M 14d
Ani
=3j 30m 35d
=3j 21m 35d
__________ +
6j 52m 10d

Selisih
8j 26m 14d
6j 52m 10d
_________ -
1j 34m 4d

Jawaban D

21).kurang jelas soalnya ,data kurang lengkap