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OpenStudy (anonymous):
Mary's paycheck was for $600.00. When she cashed her check at the bank, the teller gave her a total of 40 bills, both tens and twenties. How many tens did the teller give Mary?
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OpenStudy (texaschic101):
x = tens y = twenties x + y = 40 --> y = 40 - x 10x + 20y = 600 now sub 40 - x in for y in the 2nd equation and solve for x.
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