How many triangles are there in the following figure?

In a row of students, Mohan is 10th from right. Sohan is 25th from left. When they change their position then Mohan becomes 22 from right. What is the new position of Sohan from left?

Six boys are sitting around a circular table facing the centre. M is sitting second to the right of K who is sitting opposite to F. L and O are sitting opposite each other. Neither L nor R sits near F. Who sits in front of R?

' तू डाल-डाल, मैं पात-पात' लोकोक्ति का सही अर्थ है - 

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis.
7– 4 – 1 = 714, 9 – 2 – 3 = 932 8– 0–4 = ?  

The weights of 4 boxes are 30, 40, 50 and 80 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?