at a certain paint store forest green is made by mixing 4 parts blue paint with 3 parts yellow paint . verdant green is made by mixing 4 parts yellow paint with 3 parts blue paint . how many liters of yellow paint must be added to 21 liters of forest green to change it to verdant green ?
"21 liter of forset green have 12 liter of blue and 9 liter of yellow suppose we add x liter of yellow to make it a verdant green so the ratio of blue to yellow in verdant green is ¾ so the equation is blue / yellow = 12 / ( 9 + x ) = ¾ 27 + 3 x = 48 = > x = 7 answer : b"
subtract(multiply(divide(4, 3), 4), 3)