Lesson Logic problems - The solution to Problem 1

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<H2>The solution to Problem 1</H2>

Below &nbsp;(after the &nbsp;reminder)&nbsp; is the &nbsp;solution&nbsp; to the &nbsp;Problem 1&nbsp; of the lesson &nbsp;<A HREF = http://www.algebra.com/algebra/homework/word/misc/Some-logic-problems.lesson>Some logic problems</A>&nbsp; (the topic &nbsp;Miscellaneous word problems 
of the section &nbsp;Word problems&nbsp; in this site).

<BLOCKQUOTE>Problem 1 formulation (reminder)

Three boxes contain one ball each: &nbsp;white, &nbsp;black and green.
The first box is labeled as &nbsp;"White", &nbsp;the second box is labeled as &nbsp;"Black", &nbsp;and the third box is labeled as &nbsp;"White or Green", 
but none of the labels corresponds to the box content.
Can you identify, &nbsp;what ball is in each box?</BLOCKQUOTE>

Solution

First, &nbsp;consider the box labeled as &nbsp;"White or Green". 
Since this label doesn't match the box content, &nbsp;this box contains the black ball.

Now, &nbsp;consider the box labeled as &nbsp;"White".
Since this label doesn't match the box content, &nbsp;this box can contain the black or the green ball.
But we just have found that the black ball is in the box labeled as &nbsp;"White or Green".
Hence, &nbsp;the box labeled as &nbsp;"White"&nbsp; contains the green ball.

At last, &nbsp;for the box labeled as &nbsp;"Black", &nbsp;the only one opportunity remains: &nbsp;this box contains the white ball.

Answer

The box labeled as &nbsp;"White or Green"&nbsp; contains the black ball.
The box labeled as &nbsp;"White"&nbsp; contains the green ball.
The box labeled as &nbsp;"Black"&nbsp; contains the white ball.

<A HREF = http://www.algebra.com/algebra/homework/word/misc/Some-logic-problems.lesson>Back to the original lesson &nbsp;Some logic problems</A>&nbsp; (the topic &nbsp;Miscellaneous word problems&nbsp; of the section &nbsp;Word problems&nbsp; in this site).