Aschool cafeteria sells milk at 25 cents per carton and salads at 45 cents each. one week the total sales for these items were $132.50. how many salads were sold that week?

solution:

Lets start with the most amount that could have been soldusing guess and check, we can figure out that 290 salads could have been sold, while 8 cartons of milk would have been sold.

The least amount of salads that could have been sold were none.

so,

you have  0<s<290

at least none were sold, and at most 290 were sold

but I do believe you are missing part of the question