A shade of green paint is made by mixing blue paint and yellow paint in the ratio of 4 to 3. How many pints of blue paint and yellow paint are needed to make 21 pints of the green paint? A.
12 pints of blue paint and 3 pints of yellow paint
B.
9 pints of blue paint and 12 pints of yellow paint
C.
16 pints of blue paint and 9 pints of yellow paint
D.
12 pints of blue paint and 9 pints of yellow paint