Amixture of 60 liters of paint is 25% red tint, 30% yellow tint and 45% water. 9 liters of yellow tint are added to the original mixture. the percent of yellow tint in the new mixture is

The percentage of yellow tint in the new mixture will be 39.1304...%

Explanation

A mixture of 60 liters of paint is 25% red tint, 30% yellow tint and 45% water.

So, the amount of yellow tint liters.

Now, 9 liters of yellow tint are added to the original mixture. So, the total amount of yellow tint in the new mixture will be: liters.

And the total amount of the new mixture will be: liters.

So, the percentage of yellow tint in the new mixture

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!