Find the missing number in the following diagram?

Complete the following series.
ZIP, WIP, TIP, ?.

Complete the following series.
12, 8, 14, 6, 16, ?

Complete the following series.
BY, GT, LO, ?, VE

Suresh is 7 ranks ahead of Ashok in a class of 39 students. If Ashoka's rank is 17th from the end, which rank will be from the beginning of Suresh?

Umesh is taller than Satish, Suresh is shorter than Neeraj in length but taller than Umesh. Who is the tallest among them?

Sonia left her home and went 4 km east. Then she turned left and walked 6 km. Then she walked 4 km to the right. How far is he from the departure point?

Rahul walks 5 km north. Then turns left and walks 10 km. Then he turns right and walks 20 km. In the end, he again turns right and walks 10 km. So how far and in which direction is he from the starting point?