"我的书比她的书多一倍"这句话用英语怎么说?(我记得有好几种说法呢)

问题描述:

"我的书比她的书多一倍"这句话用英语怎么说?(我记得有好几种说法呢)

两位的回答都有问题,我的回答如下:
My books are twice (or two times)as many as hers.
My books are one time more than hers.
My books are more than hers by one time.