Tolong need jawaban fast :D

5 anak

n1= 2p
n2 =2p-2
n3 = p+2
n4 = p+1
n5 = p
rata- rata umur 17 tahun

rata-rata(mean)
17 = (n1+n2+n3+n4+n5)/5
17 = ( 2p+2p-2+p+2+p+1+p)/5
17 = (7p+1)/5
7p+1=85
7p=84
p=84/7
p=12

umur anak tertua (n1)
=2p
=2×12
=24 (d)