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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 15th from the left. How many boys are there in the row?

A21

B23

C28

D32

Answer:

B. 23

Read Explanation:

A's new position is 15th from the left. But this is the same as B's earlier position which is 9th from the right.


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