Percius has a collection of marbles. 40% of them are clear. 20% are black, and the remainder are all the other colors. A friend of his asks if he can take five marbles. On average, how many marbles of other colors will his friend end up getting?
40% of the marbles are of other colors because 100 - 20 - 40 = 
<gadget id="calculator">100-20-40</gadget>
<output>40</output>
40.
The friend will on average get 2 other colored marbles because 5 x .4 = 
<gadget id="calculator">5*.4</gadget>
<output>2</output>
2.

<result>2</result>