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Mathematical problems of switching lights
The sequence of signal lights is red light, yellow light, green light and yellow light, and they light up every 30 seconds. In this way, each cycle takes 2 minutes. After 30 minutes from 8: 00 to 8: 30, 30 divided by 2 equals 15, that is to say, at 8: 30, the signal light * * * is red, yellow and green.

45 divided by 2 is equal to more than 22 1, that is to say, the signal light * * lights up 22 times in the order of red light, yellow light, green light and yellow light, and then lights up 1 time. So the number of times each lamp lights up is as follows:

Red: 22 × 1+ 1 = 23 (times)

Huang: 22×1+22×1+1= 45 (times)

Green: 22× 1=22 (times)