Answer:
you ended up having = 1/n^3[1^2+2^2+3^2...(n-1)^2]
hope this helps :')
answer:
3 parts will be 420
explanation:
total ratio: 3 + 2 = 5
5 ➳ 700
1 ➳ 700/5
1 ➳ 140
solve for 3 : 2
3 ➳ 140 * 3 = 420
2 ➳ 140 * 2 = 280
