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October 10th, 2014, 03:51 AM  #1 
Member Joined: Sep 2013 From: New Delhi Posts: 38 Thanks: 0 Math Focus: Calculus  Can anyone solve this question for me plz plz plz ???
Q.In a row of girls, Mradula is 18th from the right and Sanjana is 18th from the left. If both of them exchange their position, Sanjana becomes 25th from the left, how many girls are there in the row ? (A) 40 (B) 41 (C) 42 (D) 35 plz answer` 
October 10th, 2014, 04:25 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,922 Thanks: 1518 
What do you think?

October 10th, 2014, 12:40 PM  #3 
Senior Member Joined: Jul 2014 From: भारत Posts: 1,178 Thanks: 230  Sanjana's new position is $\displaystyle 25^{th}$ from left. But it is the same as Mradula's earlier position which is $\displaystyle 18^{th}$ from the right. Then the total number of girls = (rank from left + rank from right) 1 = (18+25)1 = 431 = 42. 

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