4÷8=50%

40×50%=20 times

Answer: If you turn 40 times, it is estimated that you will stop at red after 20 times.

3÷8=3/8

40×3/8= 15 times

Answer: If you turn 40 times, it is estimated that 15 times will stop to green.

40-20- 15=5 times

Answer: If you turn 40 times, it is estimated that it will stop blue after 5 times.