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
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ഒരു വരിയിൽ അമ്പാടി, മുന്നിൽ നിന്ന് പത്താമതും, പിന്നിൽ നിന്ന് അഞ്ചാമതും ആണെങ്കിൽ:
- വരിയിൽ ആകെ 14 പേർ ഉണ്ട്
- അമ്പാടിയുടെ മുന്നിൽ 9 പേർ ഉണ്ട്
- അമ്പാടിയുടെ പിന്നിൽ 4 പേർ ഉണ്ട്