Explanation

• Doctor: Nurse:: leader: Follower
• ***
• Just as a nurse follows the doctor's instructions, so also a follower works as directed by the leader
  

Explanation

• Professor: Lecture: : Doctor:  Medicine. 
• ***
• Professor delivers lectures to his students.
• Similarly, a doctor gives medicine to his patients.

Explanation

• man: machine: master: slave
• **
• The machine is made to work under the instructions of man. Similarly, a slave works under the instructions of his master.
  

Explanation

• skeleton: body: grammar: language
• ***
• Just as the skeleton forms the framework of the body, so also Grammar lays down the essentials of language
  

Explanation

There was sufficient food for 200 student for 31 days. After 27 days 120 days student left

So remaining students =200−120=80

Remaining days =31−27=4 days

Now there is sufficient food for 200 students for days. 

∵ 1 student can take the food =200×4 days

∴ 80 student can take the food = 

80

200×4

​

 =10 days

Extra days =10−4=6 days

Explanation

25man. 150kg ..30 days

45 man... 450 kg..xdays

x = 25/45x450 / 150x30 = 50 days

50 days

x=25/45x450/150x30=.50 days

Explanation

Total distance = 6,000+6,000=12,000 (from Lahore to Karachi, and then from Karachi to Lahore).

Total time = 22+28=50 hours.

Hence, average speed is 240 km/hr

Explanation

This is an arithmetic sequence with common difference of 3.

The first element is 1, and total elements are 101. So, a1 = 1, d = 3 and n = 101.

Therefore, by using the formula of nth term of an arithmetic sequence, we have 301 .