Tiffany bought \(\cfrac{2}{5}\) kg of cherries. Linda bought \(\cfrac{1}{10}\) kg of cherries less than Tiffany. How many kilograms of cherries did they buy altogether?
Mr. Rivas bought a can of paint. He used \(\cfrac{3}{8}\) of it to paint a bookshelf. He used \(\cfrac{1}{4}\) of it to paint a wagon. He used some of it to paint a birdhouse and has \(\cfrac{1}{8}\) of the paint left. How much paint did he use for the birdhouse?