Lele climbed the stairs with his brother. Lele went to the third floor and his brother went to the fifth floor. At this rate, what floor will Lele go to when she gets to the seventh floor?

Lele reached the third floor, Lele only climbed the second floor, and his brother reached the fifth floor, and his brother only climbed the fourth floor. Because the first floor doesn't count.

So my brother climbed the stairs twice as fast as Lele, and 4 divided by 2=2.

So Lele went to the 7th floor. In fact, Lele only climbed 6 stairs, so my brother climbed 6X2= 12 stairs. 12+ 1= 13 is my brother's floor, and the floor is 13.