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90a + 160b = 175 x 130 = 22750; a + b = 175 so a = 175 - b

90 (175 - b) + 160b = 22750

15750 - 90b + 160b = 22750

70b = 22750 - 15750

70b = 7000

b = 100 so a = 75

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15y ago

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