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3 men and 5 women together do a job in 3 days. working in same job 3 women take 5 days more than the time required by 2 men find ratio of men to women?

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Will simple desktop calculators be allowed in CAT 2018 like CAT 2017?
Should we use calculators for difficult and lengthy calculations that often come in the DI section or should we attempt them using approximation technique?

4 3 4.5 8.5 20 53 162.5 which no is wrong