a. A test has 25 questions. If a student has 21 answers correct, what percent of the questions was correct? Express your answer to the ones place.
b. An alloy contains 56 g of pure silver and 22 g of pure copper. What is the percent silver in the alloy? Express your answer to the ones place.
c. A collection of coins contains 11 nickels, 5 quarters, and 7 dimes. What is the percent of dimes in the collection? Express your answer to the ones place.
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