रमन एक कक्षा में ऊपर से सोलहवें और नीचे से उनपचासवें स्थान पर है। कक्षा में कुल कितने छात्र हैं?

In a row of 40 girls, when Komal was shifted 4 places to her left, her position from the left end of the row became 10th. What was Swati's position from the right end of the row, if Swati was 3 places to the right of Komal's original position?

In a row of boys, if A, who is tenth from the left, and B, who is ninth from the right, interchange their positions, A becomes fifteenth from the left. How many boys are there in the row?