Week of December 5
1.  The cost of 7 umbrellas and 3 raincoats is $724.  The cost of 3 umbrellas and 7 raincoats is $1,276.  If you buy just one umbrella and one raincoat, what is the total cost?
2.  At a certain age Amelia tells people that she is 25, but that's not her real age.  Amelia mentally omits Saturdays and Sundays when calculating her age, since she feels she is resting and does not age on weekends.  How old is Amelia really?
3.  Seventy people numbered consecutively from 1 to 70 are seated, evenly spaced, around a circular table.  What is the number of the person seated directly opposite person number 23?
4.  The difference between 2/5 of Ben"s number and 2/7 of his number is 1/2 the sum of the 8th and 11th prime numbers.  What is Ben's number?
5.  At a tax-free sale, Madeline paid $134.76 for 1 calculator and 7 CDs.  At the same sail, Eme paid $112.33 for 2 calculators and 3 CDs.  The 3 calculators were priced the same, and the 10 CDs were priced the same.  How much did each calculator cost?