In the following question, by using which mathematical operators will the expression become correct?
30 ? 6 ? 4 ? 5 ? 4

If 72 men can build a wall of 280 m length in 21 days, how many men could take 18 days to build a similar type of wall of length 100 m? 

Three different positions of the same dice are shown. Find the number on the face opposite to the face showing'2'.

6 carpenters make 96 windows in 16 days. If 8 carpenters work for 4 days how many windows will they make?

In the following questions, the first and the last part of the sentence are numbered 1 and 6. The rest of the sentence is split into four parts and named P Q R and S. These four parts are not given in their proper order. Read the parts and find out which of the four combinations is correct. Then find the correct answer and indicate the correct response.

1. The teacher training agency in England hopes to make teaching one of the top three professions.
P. They have also demanded that the campaign should be matched by improved pay scales, work load and morale so as to avoid recruitment problems with an aim to raise the image of the teaching profession.
Q. A series of advertisements are now being screened showing famous people speaking about teachers they remember and admire.
R. An amount of $ 100 million has been set aside to combat the shortage of applicants for teacher training.
S. Teacher Unions have welcomed this campaign.
6. It is high time for the Indian Government also to think on similar lines and take steps to lift up the sinking morale of the teaching profession. 

Who of the following attended all the Three Round Table Conferences? 

How many such pairs of letters are there in the word ‘EVAPORATE’ each of which has as many letters between them in the word as they have between them in the English alphabet?