この部屋(へや)は前(まえ)の部屋(へや)の二倍(にばい)の広(ひろ)さです。

This room is twice as large as the previous room.

去年(きょねん)の二倍(にばい)のお客(きゃく)さんがこの店(みせ)に来(き)ました。

Twice as many customers came to this store as last year.

このケーキはいつもの二倍(こ)の値段です。

This cake costs twice as much as usual.

弟(おとうと)は私(わたし)