Problema Solution
The school store sells pens for $0.35 each and pencils for $0.15 each. Anthony spent $2.80 to buy a total of 13 pens and pencils. How many pens did anthony buy?
Answer provided by our tutors
let
x = the number of pens, where x is non-negative integer
y = the number of pencils, where y is non-negative integer
Anthony spent $2.80 to buy a total of 13 pens and pencils
0.35x + 0.15y = 2.80
x + y = 13
by solving the above system of equations we find
x = 4.25 pens
y = 8.75 pencils
click here to see the step by step solution of the system of equations
the solutions of the system are not integer numbers (the number of pencils and pens sold must be integer) thus there is no solution.