1956 AHSME Problems/Problem 47
In 1 day, machines can do of the job , and machines of the job. So machines can do of the job in 1 day, and 1 machine can do of the job in 1 day. Hence, **18** days are needed for 1 machine to complete the job;
In 1 day, machines can do of the job , and machines of the job. So machines can do of the job in 1 day, and 1 machine can do of the job in 1 day. Hence, **18** days are needed for 1 machine to complete the job;
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