"The museum has a lot of interesting paintings."
Translation:El museo tiene muchas pinturas interesantes.
Yes, cuadros is the correct spelling
I gave the same answer and was told that cuadros is feminine? Ummm - no, it's NOT!! I reported it - hope you did as well.
I think "cuadro" has a more general meaning, like English "portrait". It might even be a photograph taken on camera as long as it's mounted within a frame and presented as a piece of art. "Pintura" implies it must have necessarily been painted by the author.