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2. If m men can do a job in d days, then the number of days in which m+r mencan do the job is(A) d+ r;(B)(m + r);(D)éťm+r?m-+r |
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Answer» One man will takemtimes as longto do the same job, so, the rate of workingfor 1 man is:[ 1 job ] / [ d * m days ] =1/dm--------------------More men will get the job done faster, so the new rate is[ m + r men ] x [ rate for 1 man ] =m+r/dm--------------------Now convert this to [ 1 job ] / [ time to do the job ]by dividing top and bottom bym+r---------------------------m+rmen will takedm/m+r daysto do the job Like my answer if you find it useful! |
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