Question 21. There is a group of five teachers a, b, c, d and e
* b and c teaches maths and geography
* a and c teach maths and history
* b and d teach political science and geography
* d and e teach political science and biology
* e teaches biology, history and political science
Who teaches Maths, Geography and History?

Question 22. There is a group of five teachers a, b, c, d and e
* b and c teaches maths and geography
* a and c teach maths and history
* b and d teach political science and geography
* d and e teach political science and biology
* e teaches biology, history and political science
Who teaches political science, history and biology?

Question 23. There is a group of five teachers a, b, c, d and e
* b and c teaches maths and geography
* a and c teach maths and history
* b and d teach political science and geography
* d and e teach political science and biology
* e teaches biology, history and political science
Who teaches maths, geography and history ?

Question 24. There is a group of five teachers a, b, c, d and e
* b and c teaches maths and geography
* a and c teach maths and history
* b and d teach political science and geography
* d and e teach political science and biology
* e teaches biology, history and political science
Who teaches Maths, Geography and History?

Question 25. 1. Gita, Ravi and Suresh are children of mr. and mrs. Khanna
2. Renu, Raja and Sumit are children of mr. and mrs. Chopra
3. Sumit and Gita are married and Ashok and Sanjay their children
4. Garima and Ram are children of mr. and mrs. Chawla
5. Garima is married to Suresh and has three children Lata, Sonu, Raju
How is Ravi related to Raju?