If 3 of the crew each need 3,000 calories of food per day and the other 3 each need 2,500 calories per day, how many total calories would they need for a 2 week-long mission?

231,000

Explanation:

3 × 3,000 = 9,000

3× 2,500 = 7,500

9,000 + 7,500 = 16,500

That is 16,500 calories per day for 14 days, because 2 weeks =14 days.

16,500 × 14 = 231,000 calories over 2 weeks

you probably have to do it with your email