The ratio of schooners to skiffs in the bay was 7 to 5. if there were 63 schooners in the bay, how many skiffs were there?

7/5 = 63/x
cross multiply
(7)(x) = (63)(5)
7x = 315
x = 315/7
x = 45 <=== if there were 63 schooners, then there were 45 skiff's 

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

The answer is 25uthere is no v in the question