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OpenStudy (anonymous):
A person has 20 coins, all nickels and dimes, worth one dollar and 40 cents. How many nickels are there? If n = number of nickels and d = number of dimes, which system of equations represents the problem? n + d = 20 and n + d = 1.40 n + d = 20 and 5n + 10d = 1.40 n + d = 20 and 5n + 10d = 140
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