A secretary can add 40 columns of figures in an hour by using a calculator and 20 columns of figures an hour without using a calculator. The total number of hours it would take him to add 200 columns if he does three fifths of the work by machine and the rest without the machine is

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A secretary can add 40 columns of figures in an hour by using a calculator and 20 columns of figures an hour without using a calculator. The total number of hours it would take him to add 200 columns if he does three fifths of the work by machine and the rest without the machine is






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