at deluxe paint store , fuchsia paint is made by mixing 5 parts of red paint with 3 parts of blue paint . mauve paint is made by mixing 3 parts of red paint with 5 parts blue paint . how many liters of blue paint must be added to 40 liters of fuchsia to change it to mauve paint ?
"in 40 liters , red = 5 / 8 * 40 = 25 and blue = 15 so , 25 / ( 15 + x ) = 3 / 5 or , x = 26.6 ( answer e )"
subtract(multiply(divide(multiply(40, divide(5, add(5, 3))), divide(3, add(5, 3))), divide(5, add(5, 3))), subtract(40, multiply(40, divide(5, add(5, 3)))))