Hanya nomor 21 ya, jangan lupa pakai cara ya

40 3per5 – 23 3per10=40 6per10-23 3per10=17 3per10
semoga benar maaf kalo salah THx

40 3/5=203/5
                          =203/5-233/10=406/10-233/10=173/10ton
23 3/10=233/10
moga moga gitu thxxxxx