What number comes next?
Look at the series (538, 403, 120, ?), determine the pattern, and find the value of the next number!Correct answers: 69
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
Rail detector carIn 1928, a rail detector car was demonstrated near Poughkeepsie, N.Y. to representatives of the American Railway Association and of various railroads. Invented by Dr. Elmer Ambrose Sperry, it was designed to enable locating internal flaws in existing railroad tracks. This first car, car No. 101, was capable of travelling at 10 mph while examining one rail at a time. It had been previously field-tested 13 Jun 1928. |