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Mathematics, 14.11.2020 08:30 dvnive

Denis bought 50 postage stamps for which she paid $13.00. Some were 20-cent stamps and some were-40 cent stamps. How many of each did she buy? (Please show work with Substitution or Elimination Method)

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Denis bought 50 postage stamps for which she paid $13.00. Some were 20-cent stamps and some were-40...
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