please help me my last question on my math test please help me its due on 10:10am please help me please i really need help please

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21