math
posted by betty on .
suppose you bought some 32 cent stamps and some 20 cent stamps. you spent $3.92 for 16 stamps. how many of each stamp did you buy?
x = number of 32 cent stamps
y = number of 20 cent stamps
==================
x+y = 16
0.32x + 0.20y = 3.92
solve for x and y.
Check my thinking.
x + 20y = 12.25
i don't understand how to get the numbers for x and y
help please

6 32 cent stamps
10 20 cent stamps