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u5 = 12
maka,
u5 - u3 =2b
2b = 12 - 7
b = 2,5
jumlah umur ke 6 anak = (2 x 2 + 5 x 2,5 )
= 3 x (16,5)
=49,5 tahun
jadi jumlah umur ke 6 anak tersebut adalah 49,5 tahun
u5 = a + 4b = 12
----------------- ---
-2b = -5
b = 2,5
a + 2(2,5) = 7
a = 7-5
a = 2
Sn = n/2 (2a + (n-1)b)
S6 = 6/2 (2(2) + (6-1)2,5)
S6 = 3 (4+12,5)
S6 = 3(16,5)
S6 = 49,5