Find number abcIf a0121 + 333c1 = 123ba2 find number abc. Multiple solutions may exist.
Correct answers: 20
The first user who solved this task is Nílton Corrêa De Sousa.
Chicago Lake TunnelIn 1866, the first water supply tunnel for a U.S. city was completed for Chicago, Illinois. The Chicago Lake Tunnel extended 10,587 feet under Lake Michigan to an inlet crib. It was 5 feet in diameter. The city engineer was Ellis Sylvester Chesbrough at the time of construction. Work started on 17 Mar 1864 at a final cost of $380,784. Water was not allowed into the tunnel until 25 Mar 1867. The pumping station with the standpipe tower still stands at the intersection of Michigan Blvd and Chicago Ave., having escaped destruction in the 1871 Chicago fire.