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u2 = x+y
u3 = x+2y
u8 = x+7y
u11 = x+11y
x+y + x+2y + x+7y + x+10y = 60
4x+20y = 60
x+5y = 15
u6 = x+(6-1)y
u6 = x+5y
u6 = 15 (dari persamaan diatas)
a + b + a + 2b + a + 7b + a + 10b = 60
4a + 20b = 60
a + 5b = 15
Kita tahu bahwa U6 = a + 5b maka U6 = 15.