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Verified answer
5a + 2b = 4000 ×32a + 3b = 2700 ×2
15a + 6b = 12000
4a + 6b = 5400
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11a = 6600
a = 600
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5 (600) + 2b = 4000
3000 + 2b = 4000
2b = 1000
b = 500
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1 kue A = Rp600
2 kue B = Rp1000
1000+600 = Rp1600 jawabannya