Question 815557
<pre>
Let n represent the answer, the number of nickels in the roll.

$0.05n = $5.00

Drop the dollar marks

 0.05n =  5.00

Multiply both sides by 100 (move the decimals two places to the right)

    5n = 500

Divide both sides by 5

    {{{(5n)/5}}} = {{{500/5}}}

Cancel the 5's on the left side of the equal sign and divide 500 by 5 on
the right side:

    {{{(cross(5)n)/cross(5)}}} = 500÷5

      n = 100

Edwin</pre>

[You might point out that a standard roll of nickels is worth $2, not $5
and it contains 40 nickels not 100, so this is a much longer roll of nickels,
{{{2&1/2}}} times as long as a standard roll.]