Why was the three fifths compromise necessary at the constitutional convention?

The Three Fifths Compromise was necessary.  It balanced representation in the House of Representatives between Northern states with smaller populations and Southern states with large number of enslaved people whose numbers could unfairly tip the scales. The compromise counted enslaved people as 3/5's of a person for purposes of representation.  

35 is your answer because i looked it up

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.