||Before Eleanor found the $4, she had $6. If she
had lost $4 from the $6, she would have had only
$2 left. The $4 she found plus the $6 she already
had means she now has $10, which if 5 times the
$2 should would have had if she had lost $4 instead
of finding $4.
STRATEGY: Guess and check.
Source: Inspired by a puzzle
inPut on Your Thinking Cap,Helen Jill
Fletcher. New York: Abelard-Schuman, 1968.