Paul has a mix of quarters and dimes in his piggybank. He has twice as many dimes than he has quarters. He counts all his coins and notices that he has nine dollars in total. How many quarters does Paul have?
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Paul has a mix of quarters and dimes in his piggybank. He has twice as many dimes than he has quarters. He counts all his coins and notices that he has nine dollars in total. How many quarters does Paul have?
D = 2Q
10D + 25Q = 900
10(2Q) + 25Q = 900
20Q + 25Q = 900
45Q = 900
Q = 20
D = 2Q
D = 2 • 20
D = 40
check answer
20 quarters is 5 dollars
40 dimes is 4 dollars
total is 9 dollars
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