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May 11th, 2018, 01:29 AM   #1
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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?
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May 11th, 2018, 01:51 AM   #2
lua
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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 $\displaystyle n=18$.
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May 11th, 2018, 03:00 AM   #3
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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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