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kue donat = x
kue lapis = y
x + y = 80.....................................x150
250x + 150y = 17000......................x1
150x + 150y = 12000
250x + 150y = 17000
------------------------------- -
-100x = -5000
x = 50
x + y = 80
50 + y = 80
y = 30
Berarti jumlah kue lapis (y) adalah 30