Determine the number based on the ratio.

If A:B = 7:1 What is B if A is 42 =  ?

If A:B = 5:13 What is B if A is 15 = ?

If A:B = 8:2 What is A if B is 8 = ?

If A:B = 6:3 What is B if A is 48= ?

If A:B = 1:11 What is B if A is 5= ?

If A:B = 3:13 What is A if B is 78= ?