Question 1117899
Similar problem, different numbers.
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 Sally has 52 coins all dimes and nickels that have the total value of $4.20. How many nickels does this bitch have?
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 n + d = 52
 5n +10d = 420
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 Or:
 52 nickels = 260
 Each nickel replaced by a dime adds 5 cents.
 420 - 260 = 160
 160/5 = 32 replacements by dimes.