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1 sepatu + 1 sandal = 82.500
1 sandal = 1/2 sandal
1 spatu + 1/2 sepatu = 82500
1,5 sepatu = 82500
1/2 sepatu = 82500 / 3
1/2 sepatu = 27500
1/2 sepatu = 1 sandal
1 sandal = 27500
1 sepatu = 82500 - 27500
55000
b. 1 sepatu = 55000
10 sepatu = 55000 x 10
= 550.000
x = 2y
x + y = 82.500
x - 2y = 0
x + y = 82.500 -
-3y = -82.500
y = -82.500 / -3
y = 27.500
x + y = 82.500
x + 27.500 = 82.500
x = 82.500 - 27.500
x = 55.000
10 sepatu = 10 x 55.000 = 550.000