Problema Solution
Sara bought 8 folders and 3 rulers. Lea bought 8 rulers and 3 folders. Sara paid $ 1.25 more than Lea. How much was each folder if each ruler was $ 0.45
Answer provided by our tutors
Let 'r' and 'f' stand for the cost of each ruler and folder:
8f+3r=3f+8r+1.25
r=.45
Using Algebrator to solve for 'f', we get:
f=$0.70
let 'f' represent the cost of folders
let 'x' represent the amount paid by Lea, then 'x+1.25' represents the amount paid by Sara
x = 8(0.45) + 3f
(x+1.25) = 3(0.45) + 8f
solving this system we have:
f = 0.7
x = 5.7
each rule cost $0.70