Question

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

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