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a + 14b = 89
----------------- -
-8b = -48
b = 6
a + 6b = 41
a + 6.6 = 41
a + 36 = 41
a = 5
Maka, U20
U20 = a + (n-1)b
= 5 + (20-1).6
= 5 + 19.6
= 5 + 114
U20 = 119
U15 = a + 14b = 89
---------------------- -
- 8b = - 48
b =
b = 6
a + 6b = 41
a + 6.6 = 41
a + 36 = 41
a = 41 - 36
a = 5
U20 = a + 19.b
= 5 + 19 .6
= 5 + 114
= 119