First I did 300 divided by 2 because there are two machines. I got 150 calories each. then I did there first machine and divided 150 by 8 to get 18.75min. then I took the second machine and did the same thing, did 150 divided by 6 and got 25. then I added18.75 and 25 and got 43, but I need 40 min. so I subtracted 3 from the mon. of the second machine and got 22 instead of 25.
the first machine spend 18.75 min. and the second machine spend 22min.
750 because she on average makes 3000 dollars a month, making her monthly profit 750 but if she needs to spend each month a 500 dollar more then she is only making 250 a month multiply 250 by 3 and she made 750
