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x can copy 80 pages in 20 hours, x and y together can copy 135 pages in 27 hours. Then y can copy 20 pages in :

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x can copy 80 pages in 20 hours, x and y together can copy 135 pages in 27 hours. Then y can copy 20 pages in : 

(a) 20 hours 

(b) 24 hours 

(c) 3 hours 

(d) 12 hours

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Correct option (a) 20 hours

Explanation:

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