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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: $\displaystyle n-B=14$ $\displaystyle A=10$ $\displaystyle A-6=B$ 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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