Roger makes 70 gallons of pink paint by mixing 21 gallons of red paint with 49 gallons of white paint. what part of every gallon is from red paint

This is a problem sum that has to be carefully read and understood before trying to solve it. Based on all the information's provided, the answer to the question can be easily deduced.
Quantity of pink paint made = 70 gallons
Quantity of red paint required to make pink paint = 21 gallons
Quantity of white paint required to make the pink paint = 49 gallons
Then
Quantity of red paint required to make 70 gallons of pink paint = 21 gallons
Quantity of red paint required to make 1 gallon of pink paint = (21/70) gallons
                                                                                               = 3/10 gallons
                                                                                               = 0.3 gallons
So a total of 0.3 gallons of red paint is present in every gallon of pink paint.