In a row of girls facing North, Rinky is 10th to the left of Pinky, who is 21st from the right end. If Minky, who is 17th from the left end, is 4th to the right of Rinky, how many girls are there in the row?
1) Data inadequate
2) 44
3) 37
4) 43
5) None of these

Explanation

4, 43