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U16 = a + 14b = 172
---------------------- -
- 8b = - 72
b = - 72/ - 8
b = 9
a + 6b = 100
a + 6 .9 = 100
a + 54 = 100
a = 46
U11 = a + 10.b
= 46 + 10 .9
= 46 + 90
= 136