Maths Maths Puzzle Verbal Ability Spotting Errors

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Maths Other Question

20 men can do a job in 10 days, working 8 hours a day, If women are 33.33% more efficient than men, how many woman will it take to finish the same job in 10 days. Working 6 hours a day ?
Op 1: 10
Op 2: 12
Op 3: 15
Op 4: 20
the product of two number is 2160 and their hcf is 12. find the number of such possible pairs