Summary
You need to know the following definition:
The % v/v of any component is the number of cm3 of that
component contained in 100 cm3 of the total product.
component contained in 100 cm3 of the total product.
You should be able to solve problems involving percent volume in volume either by using ratios or by using the equation below:
% v/v = volume of component x 100 (ml/100 ml)
volume of product
volume of product