Required Mathematical Intelligence

Chapter 127 How many red lights are there on the fourth floor

In order to celebrate Beijing's successful bid to host the 2008 Olympic Games, people in a certain area dressed up the city and took to the streets to celebrate. A mathematics teacher saw a red light hanging on the local 7-story tower, so he chanted four lines of poetry: "Fire Tree Silver Flower Tower On the 4th floor, the number of red lights multiplies from layer to layer, and there are 7 red lights in total, how many red lights are there on the fourth floor?” This is an interesting question, please try to solve it.

[Answer: Let there be x lamps on the fourth floor.

x(1 2 4 8 1/2 1/4 1/8)=508
x(127/8)=508
x=32]
(End of this chapter)