Re: problem sets

Posted by Amit Goyal on
URL: http://discussion-forum.276.s1.nabble.com/problem-sets-tp7583841p7584060.html

The question says that calorie intake can be less than 5500 but not more. And all the money should be spend on popcorn and salad.
That is, the set of solutions satisfy the following two constraints:
p + 2s = 13
&
2p + s ≤ 11

Check that the above two conditions is equivalent to
p + 2s = 13
&
p ≤ 3

OR equivalently,

p + 2s = 13
&
s ≥ 5

And hence the answer is (a) and not (c).