Aworker at a snack stand opened a new box of cups. the first day he used 30 cups , the second day the worker used 15 percent of the remaining cups. a total of 90 cups were used the second day. what was the original amount of cups in the box before any were used?

Anut store normally sells cashews for? $4.00 per pound and peanuts for? $1.50 per pound. but at the end of the month the peanuts had not sold? well, so, in order to sell 40 pounds of? peanuts, the manager decided to mix the 40 pounds of peanuts with some cashews and sell the mixture for $2.00 per pound. how many pounds of cashews should be mixed with the peanuts to ensure no change in the? profit?