4.5 Value Problems

A boy has $2.25 in nickels and dimes. If there are twice as many dimes as
nickels, how many of each kind has he?
 
 
 
 
A purse contains $3.90 made up of dimes and quarters. If there are 21 coins in
all, how many dimes and how many quarters were there?
 
 
 
 
A total of $12000 was invested, part of it at 9% and the rest at 7.5%. The
total interest after one year is $1005. How much was invested at each rate?
 
 
 
 
A total of $6000 is invested, part of it at 4.25% and the rest at 5.75%. The
total interest after one year is $300. How much was invested at each rate?
 
 
 
 
A collection of dimes and quaters is worth $15.25. There are 103 coins in all.
How many of each is there?
 
 
 
 
30 coins having a value of $3.30 consists of nickels, dimes and quarters. If
there are twice as many quarters as dimes, how many coins of each kind were
there?
 
 
 
 
A total of $8500 is invested, part of it at 6% and the rest at 3.5%. The total
interest after one year is $385. How much was invested at each rate?
 
 
 
 
A bag contains nickels, dimes and quarters having a value of $3.75. If there
are 40 coins in all and 3 times as many dimes as quarters, how many coins of
each kind were there?
 
 
 
 
A collection of half dollars and nickels is worth $13.40. There are 34 coins in
all. How many are there?
 
 
 
 
A postal clerk sold some 15¢ stamps and some 25¢ stamps. Altogether, 15
stamps were sold for a total cost of $3.15. How many of each type of stamps
were sold?