The Cupertino City Library has $360$ art books. If $\dfrac{1}{3}$~of the art books is equal to $\dfrac{4}{5}$~of the science books, how many science books does the library have? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Knowing the Base Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Finding the Base