Archie is playing with his marbles outside. He loses 60% of them into the street. Of the remaining ones, he loses half down a sewer. If he has 20 left, how many did he start with?
He had 40 before losing them into the sewer because 20 x 2 =
<gadget id="calculator">40</gadget>
<output>40</output>
40.
He started with 100 because 40/.4=
<gadget id="calculator">100</gadget>
<output>100</output>
100.

<result>100</result>