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U1 ,...., U5 (aritmatika)
U1 + U2 + U3 + U4 + U5 = 100 ini berarti
a + a + b + a + 2b + a + 3b + a + 4b = 100
5a + 10b = 100 (bagi 5)
a + 2b = 20
a = 20 - 2b
U4 = 2U1
a + 3b = 2a
3b - a = 0
3b - (20 - 2b) = 0
5b = 20
b = 4
a = 20 - 2(4) = 12
U21 = a + 20b = 12 + 20(4) = 92