At a restaurant here in the city, a cup of coffee used to cost SEK 2.50 and a cup of tea SEK 2.25. At closing time one day it is stated that they sold coffee and tea for SEK 400. How many cups of coffee respectively tea can you have sold?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section7.8: Work Problems
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Can someone please help to solve this diaphonic equation: 2,50x + 2, 25y= 400. I got some answer before but it was wrong. 

At a restaurant here in the city, a cup of coffee used to cost SEK 2.50 and a cup of tea SEK 2.25. At closing time one day it is stated that they sold coffee and tea for SEK 400. How many cups of coffee respectively tea can you have sold?

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