Lizzy: Maria is baking cookies for Sally. Sally says that she wants 1/4 of her cookies to have nuts in them, 40% to have chocolate chips in them, and the remainder to have nuts and chocolate chips in them. When she adds nuts to the cookies, she uses 2 nuts per cookie. If she makes 60 cookies, how many nuts does she need?.
Me: Hmmm, let me think. I think this is the detailed solution:
35% of the cookies have nuts and chocolate chips because 100 - 25 - 40 = 35. 60% of the cookies have nuts in them because 25 + 35 = 60. She makes 36 cookies with nuts in them because 60 x .6 = 36. She needs 72 nuts because 36 x 2 = 72. Final answer: 72.