Asked by Jeff Scott

A student has a number of $40 dollar and $80 dollar savings bonds to use for part of her expenses for college. The total value of the bonds is $1000. There are 7 more $40 bonds than $80 bonds. How many of each type of bond does she have?
Answered by Steve
If there are x at $40 and y at $80, then

40x+80y = 1000
x = y+80

Now just solve for x and y
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