If it takes 1 worker 4 days to paint a flat, how many days will it take 8 workers to paint 4 flats if they all work at the same rate?
Solution
1 worker --> 1 flat, 4 days
8 workers --> 8 flats, 4 days
(8 workers give an output 8 times more)
8 workers --> 4 flats, 2 days
(Same 8 workers need only half the time for 4 flats)
Answer: 2 days
Sunday, July 18, 2010
ACS Primary 2009 PSLE Math Prelim Paper 2 Q5
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