I had some change in my pocket.  I knew that I had more than one dollar, but less than $1.50.  Here are some clues to help me figure out how many pennies, nickels, dimes, and quarters that I had in my pocket.

• I had twice as many dimes as quarters
• The number of pennies is equal to the number of days in a week
• The number of nickels is equal to number of dimes subtracted from the number of pennies

Note:  There are actually two different solutions to this problem.