Mabel is counting sharks in the ocean. She knows that of the fish that she sees, 25% will be sharks and 75% will be another type of fish. On day one she counts 15 fish. On day 2 she counts three times as many. How many sharks did she count over those two days?
She counts 45 fish on day 2 because 3 x 15 = 
<gadget id="calculator">3*15</gadget>
<output>45</output>
45.
She counts 60 fish in total because 15 + 45 = 
<gadget id="calculator">15+45</gadget>
<output>60</output>
60.
She counts 15 sharks because 60 x .25 = 
<gadget id="calculator">60*.25</gadget>
<output>15</output>
15.

<result>15</result>