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svp [43]
3 years ago
10

Kathi and Robert

Mathematics
1 answer:
Ad libitum [116K]3 years ago
4 0

10.5x + 3y = 811.5

x + y = 97

y = 97 - x

3y = 291 - 3x

7.5x + 291 = 811.5

7.5x = 811.5 - 291

x = 520.5 / 7.5

x = 69.4

69 were sold at the original price

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