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【OG20-P278-294题】If a school district paid a total of $35 per desk for x desks and a total of $30 per table for y tables, what was the total amount that the district paid for these desks and tables?
1. The total amount the district paid for the y tables was $900.
2. x=90, and the total amount the district paid for the x desks was 3.5 times the total amount the district paid for the y tables.
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