What is the probability that a vehicle is white?

Which ratio is equivalent to 10: 85

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.