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7.3.1: Systems of Linear Equations – Special Cases (Exercises)
https://stats.libretexts.org/Courses/Fresno_City_College/New_FCC_DS_21_Finite_Mathematics_-_Spring_2023/07%3A_Matrices/7.03%3A_Systems_of_Linear_Equations__Special_Cases/7.3.01%3A_Systems_of_Linear_Equations__Special_Cases_(Exercises)
The sum of digits of a two digit number is 9. The sum of the number and the number obtained by interchanging the digits is 99. If the total worth of the coins is $1.80, how many are there of each? A c...The sum of digits of a two digit number is 9. The sum of the number and the number obtained by interchanging the digits is 99. If the total worth of the coins is $1.80, how many are there of each? A company is analyzing sales reports for three products: products X, Y, Z. One report shows that a combined total of 20,000 of items X, Y, and Z were sold. Another report shows that the sum of the number of item Z sold and twice the number of item X sold equals 10,000.

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