Tiffany is measuring how many surfers can ride a big wave without falling. She sees that when a wave over 30 feet arrives, only 25% of the riders can stay upright. Of these riders, 60% are women. If there are 100 riders, how many men can stay upright on the wave?
25 riders stayed upright because 100 x .25 = 
<gadget id="calculator">100*.25</gadget>
<output>25</output>
25.
Of these riders 10 were men because 25 x .4 = 
<gadget id="calculator">25*.4</gadget>
<output>10</output>
10.

<result>10</result>