Kyle has a total of 16 coins in his pocket. All the coins are nickels or quarters, and they have a total value of 2 point 2 0 dollars How many nickels does Kyle have?

Let n be the number of nickels and q the number of quarters. There are 16 coins, so n + q = 16; their value in cents gives 5n + 25q = 220. Dividing the value equation by 5 and subtracting n + q = 16 gives 4q = 28, so q = 7 and n = 9. Kyle has 9 nickels, which is choice D.

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