\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
To build \(\textcolor{colordef}{1}\) bookshelf, \(\textcolor{colorprop}{10}\) wooden planks are needed. How many wooden planks are needed to build \(\textcolor{colordef}{3}\) bookshelves?
wooden planks