According to a recipe, 2 1/2 cups of chocolate chips are needed to make a large batch of cookies. Manuel decided to make only 1/3 of the cookies. How many cups of chocolate chips will Manuel need? (You can either Multiply or Divide and the answer has to be either 5/6 or 6)

6

Step-by-step explanation:

Okay so you don't have a number of cookie makes it a bit harder but since the answer can only be 5/6 or 6 we'll say there is 45 cookies. So 1/3 of 45 = 15

so 15 divided by 2 1/2 = 6

3 is greater then both of those numbers

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.