Jawabanmu

2014-06-11T09:25:14+07:00
U10 = 41 = a + 9b
U5   = 21 = a + 4b

20   = 5b
b     = 20 : 5 = 4

U5   = a + 4b
21   = a + 4 x 4
21   = a + 16
 a    = 21 - 16
 a    = 5

U20 = a + 19b
U20 = 5 + 19 x 4
U20 = 5 + 76
U20 = 81
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