Answer:
113.1
Step-by-step explanation:

This is the formula you have to follow, finding the volume of objects is hard without the formula and it's just something you'll have to memorize. BUt just remember to plug in the radius which is 3 in this problem, into the volume formula: 
2(30)=60+30=90. thats a right angle which is 90 degrees so the answer is 30
Ratio)
schooners= 7
skiffs= 5
Problem)
schooners=63
skiffs= ?
set up fractions
(7/5)=(63/?)
cross multiply (multiply 63 and 5, then divide by 7)
?=45