Matthew goes hiking every 12 days and swimming every 6 days. he did both kinds of exercise today. how many days from now will he go both hiking and swimming again? can you explain how you do this?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?