In a field of 500 clovers, 20% have four leaves and one quarter of these are purple clovers. Assuming these proportions are exactly correct, how many clovers in the field are both purple and four-leaved?
There are 500/5= 
<gadget id="calculator">500/5</gadget>
<output>100</output>
100 four leaf clovers.
There are 100/4= 
<gadget id="calculator">100/4</gadget>
<output>25</output>
25 purple four leaf clovers.

<result>25</result>