You earned a 84% on a science test. you answered 21 questions correctly. how many questions were on the test?

Grandma made an apple pie. josh and his brother joe finished 4/5 of it. then 3 friends came over and shared the left over. how much pie did each friend eat

Question and answers are in the attached picture. you so much in advance.

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48