In the evening Raman faces the sun and walks for ten kilometres. He then turns left and walks for 20 km. Then he turns left again and walks for 10 km. In which direction is Raman standing with respect to the starting point?

My sister's age is thrice my age, and 7 years less than my brothers age. If my age is 13 years, then what was the age (in years) of my brother at the time of my birth?

Rohit starts from his school and walks 10 km west, turns north and walks 25 km, turns east and walks 5 km, turns south and walks 10 km, and finally turns east and walks 5 km. How far is Rohit from his school?

In a row of boys Rahim is 9th from the right and Pankaj is 12th from the left. If they interchange their positions Pankaj becomes 25th from the left. How many boys are there in the row?