What number should replace the question mark?

The number of students who took any three of the above subjects was

I am facing south. I turn right and walk 20 m. Then I turn right again and walk 10 m. Then I turn left and walk 10 m and then turning right walk 20 m. Then I turn right again and walk 60 m. In which direction and I from the starting point

The positions of the first and the second digits in the number 94316875 are interchanged. Similarly, the positions of the third and fourth digits are interchanged and so on. Which of the following will be the third to the left of the seventh digit from the left end after the rearrangement?

If θ = equal to ; × = less than; then a x b θ c implies that

If + =not greater than ; × = less than then  c + b x a means

Raj travelled from a point X straight to Y at a distance of 80 metres. He turned right and walked 50 metres, then again turned right and walked 70 metres. Finally, he turned right and walked 50 metres. How far is he from the starting point

Ram and Sham are ranked 13th and 14th respectively in a class of 23. What are their ranks from the last respectively?