A feed store sells two varieties of birdseed: Brand A, which is 40% millet and 60% sunflower, and Brand B, which is 65% millet and 35% safflower. If a customer purchases a mix of the two types of birdseed that is 50% millet, what percent of the mix is Brand A?
Pick
A) 40% B) 45% C) 50 % D) 60 % E) 55 %
Another method to solve this question using equations:   1 kg of Brand A will have 400g millet and 600g sunflower.   1 kg of Brand B will gave 650g millet and 350g sunflower.   Suppose,x kg of Brand A and y kg of Brand B are in the mixture.   Then total weight of millet = 400x+650 y g   Total weight of mixture = 1000x + 1000 y g   Given that millet is 500% hence   (400x+650y)/(1000x + 1000y) = 1/2   or, 800x + 1300 y = 1000x+1000y   or 300y=200x   or, x/y = 3/2   % of Brand A = (3/(3+2))*100= 
<gadget id="calculator">(3/(3+2))*100</gadget>
<output>60</output>
60%   Hence answer is 60 %
<result>D</result>
A feed store sells two varieties of birdseed: Brand A, which is 40% millet and 60% sunflower, and Brand B, which is 65% millet and 35% safflower. If a customer purchases a mix of the two types of birdseed that is 50% millet, what percent of the mix is Brand A?