Ivanna has budgeted $331.50 to spend on meals during her vacation. She plans on averaging $8.50 per meal.
If she plans on eating three meals per day, how long is Ivan's vacation?

13 days.

Step-by-step explanation:

What I did was I took 331.50 and divided that by the amount of each meal.

331.50/8.50= 39 meals

Then divide the number of meals by the number of meals per day.

39/3= 13 days.

630 cups

Step-by-step explanation:

Percentages

This problem is most easily solved backward, i.e., from the final data up to the beginning.

There was a new box of cups and the worker at a snack stand opened it. He first used 30 cups from the box and the second day he uses 15% of the remaining cups in the box, and we are told that represents 90 cups.

If 15% (0.15) equals 90 cups, then the number of cups before the second day was 90/0.15 = 600 cups.

On the first day, we used 30 cups, thus the original number of cups in the box was 600+30=630 cups