Problema Solution
Four gallons of paint contain 2.5% pigment. How many galloons of paint that is 6% pigment must be added to make a paint that is 4% pigment?
Answer provided by our tutors
let
x = gallons of paint that is 6% pigment
we must mix x with 4 gallons of paint that is 2.5% pigment to obtain (x + 4) gallons of paint that is 4% pigment
0.06*x + 0.025*4 = 0.04*(x + 4)
by solving the equation we find
x = 3 gallons
we must add 3 gallons of paint that is 6% pigment.