###Human: Toby is counting goldfish in the local pond. He knows that only 25% of goldfish are at the surface and the rest are too deep below the surface to be able to see. If he counts 15 goldfish, how many are below the surface?, ### Assistant: There are 60 goldfish because 15 / .25 = 60
75% of the fish are below the surface because 100 - 25 = 75
There are 45 goldfish below the surface because 60 x .75 = 45 
 So the answer is :  45