If mAGD = a+2b and mABC = 2a - b find the values of a and b

How do i do this activity, is appreciated

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

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.