i had $420 made up of two dollar notes and five dollar note.the number of two dollar notes and five dollar notes was the same.how many five dollar did i have?
F = number of five dollar notes. T = number of two dollar notes
5F + 2T = 420 (1)
T = F (2)
Use (2) in (1)
5F + 2F = 420
7F = 420
F = 60
There were 60 five dollar notes (and the same number of two dollar notes).
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