Math Problems for children from 5 to 15 (2004) [pdf]
&gt; The hypotenuse of a right-angled triangle (in a standard American examination) is 10 inches, the altitude dropped onto it is 6 inches. Find the area of the triangle. American school students had been coping successfully with this problem over a decade. But then Russian school students arrived from Moscow, and none of them was able to solve it as had their American peers (giving 30 square inches as the answer). Why?<p>That&#x27;s a good one. I know the answer but won&#x27;t reveal it since it&#x27;s a fun one to discover yourself.