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garpu = g
4s + 5g = 54.900 |x 1|
2s + 3g = 30.700 |x 2|
4s + 5g = 54.900
4s + 6g = 61.400
--------------------------- -
-g = -6.500
g = 6500
substitusi
2s + 3(6500) = 30.700
2s + 19.500 = 30.700
2s = 11.200
sendok = 5.600
Jumlah 1sendokdansatugarpu = 6.500+5.600 = 12.100
y= garpu
4x + 5y = 54900 |x 2
2x + 3y = 30700 |x 4
8x + 10y = 109800
8x + 12y = 122800
2y=13000
y= 6500
2x + 3(6500)= 30700
2x + 19500 = 30700
2x = 11200
x = 5600
x+y = 12100