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Student are sitting in a row in which the position of A is 19th from the right and that of B is 17th from the left. If they interchange their positions, B’s position becomes 11th from the left. How many students are there in the row?

Student are sitting in a row in which the position of A is 19th from the right and that of B is 17th from the left. If they interchange their positions, B’s position becomes 11th from the left. How many students are there in the row? Correct Answer 29

Draw A and B’s positions in a straight line.

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Now they interchange their positions and B becomes 11th from left end.

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Now we can see B is 11th from left and 19th from the right.

There total boys in this row = 11 + 19 - 1 = 29.

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