1.The probability in favor of an event is 5/11. what are the odds that the event wiil not occur?

      a. 11:6             b.5:6                    c. 6:11              d.6:5

 

2. Calvin invested $7500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total 

     interest for the year was $890. How much money did he invest at 12%? 

 

1번 답은 d, 2번 답은 7000 이래요

어덯게 이리 나오는지 식풀이 좀 부탁드려요