# stamps problem

• Feb 2nd 2010, 08:26 AM
mathos
stamps problem
hello

we bought 100 stamps with total cost of 100 dollars
the stamps are priced at 5, 3, and 0.5 dollars

how many stamps of each price do we bought?

can you solve it with equations and with logical/practical calculations?

thanks
• Feb 2nd 2010, 08:37 AM
e^(i*pi)
Quote:

Originally Posted by mathos
hello

we bought 100 stamps with total cost of 100 dollars
the stamps are priced at 5, 3, and 0.5 dollars

how many stamps of each price do we bought?

can you solve it with equations and with logical/practical calculations?

thanks

$5 stamps = a$3 stamps = b
$0.50 stamps = c $5a+3b+0.5c = 100$ $a+b+c = 100$ Not sure where to go from there • Feb 2nd 2010, 08:44 AM Quacky$5 stamps = a
$3 stamps = b$0.50 stamps = c

(3) $\frac {a}{2} + \frac {b}{2}+0.5c=50$
$0.5c= 50-\frac {a}{2}-\frac {b}{2}$
$5a + 3b + 50-\frac {a}{2}-\frac {b}{2}=100$