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?
A step-by-step solution is:
45
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.

.

The final answer: 45