According to the following information, the equation is listed to solve the problem: from a distance, the number of red lights doubles on the sixth floor of the towering tower. * * * There are 189 lights. How many lights are sharp?
Suppose there is an X light on the tower top, then there are X, 2x, 4x, 8x, 16x, 32x in turn. According to the meaning of the question, the equation is listed as follows
x+2x+4x+8x+ 16x+32x = 189
63x= 189
x=3