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Which sentence below expresses numbers correctly?
O Did you know that the earth is 4,500,000,000 years old?
There were only twenty four desks for the thirty children in Mr. Clark's morning kindergarten class.
O The average weight of a chocolate bar was one fourth greater in the sixties than today.
O "If you 2 don't settle down right now I am going to turn this car around!" yelled Dad.