Problema Solution
A ten pack of pens at the drug store costs $1 more than two times the cost of a single pen. If you buy 4 single pens and 6 ten packs of pens , the total bill is $28 . Find the approximate cost of a single pen
Answer provided by our tutors
let
p = the cost of a single pen
q = the cost of a ten lack
ten pack of pens at the drug store costs $1 more than two times the cost of a single pen
q = 1 + 2p
if you buy 4 single pens and 6 ten packs of pens , the total bill is $28
4p + 6q = 28
by solving the system of equations
q = 1 + 2p
4p + 6q = 28
we find
p = $1.375
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the cost of a single pen is $1.375.