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May 11th, 2018, 02:29 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  How many boys are there in the row?
In a row A is tenth from the left end. B is fifteenth from the right end. There are 5 boys in between A and B. How many boys are there in the row? Ans: there are two answers one is 18 and other is 30 I assume is tenth from the left end. B is fifteenth from the right end. There are 5 boys in between A and B. I added all the numbers = 10 + 5 + 15 = 30 But other answer is 18. How? 
May 11th, 2018, 02:51 AM  #2 
Member Joined: Jan 2018 From: Belgrade Posts: 55 Thanks: 2 
This is the case when $\displaystyle B$ is to the left in relation to $\displaystyle A$. In that case, you can write: $\displaystyle nB=14$ $\displaystyle A=10$ $\displaystyle A6=B$ where n is number of boys. From here, you get $\displaystyle n=18$. 
May 11th, 2018, 04:00 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,107 Thanks: 1907 
You are told about five boys, but not told whether any of the others in the row are boys, so 18 and 30 aren't the only possibilities.


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