A syllogism is an argument which is composed with three different parts.
One main idea is- how the civil war forced the states to choose between two unions.
So u do cross multiplication first
1.5/6=10/p ---> 1.5p=10×6
1.5p=60
then divide both sides by 1.5 since u want p by itself
p= 60/1.5
p=40
Hope this helps!!❤️❤️❤️❤️❤️❤️❤️❤️