4/3
Step-by-step explanation:
2:6 = N:4 (a:b = c:d)
8 = 6N (ad = bc)
4/3 = N as the answer.
Wait... let's say the proportion is 2:4 = N:6 instead, since the answer 4/3 is not in the choices.
2:4 = N:6
12 = 4N
3 = N (choice B)
That's all. Hope it helps.
