A can do a work in 15 days and B in 20 days.

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asked May 15 in Class VIII Maths by muskan15 (-2,329 points)

A can do a work in 15 days and B in 20 days. If they together work on it for 4 days  what fraction of the work will be left ?

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1 Answer

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answered May 15 by priya12 (-11,279 points)

A’s 1 day work = 1/15

B’s 1 day work = 1/20

(A + B)’s 1 day work = 1/15 + 1/20

   = (4 + 3)/60 = 7/60

(A +B)’s 4 days work = (7/60) × 4 = 7/15

Remaining work = 1 – (7/15) = (15 – 7)/15

= 8/15

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