<PRE><B>Question 959586</B>
You can say:
5 bricklayers take 6 days to do 1 job
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If another job requires 4 times the number of bricks
you can say that is 4 jobs, so
7 bricklayers take {{{ d }}} days to finish 4 jobs
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7 times as many bricklayers can do 1 job in 1/7 the time, so
35 bricklayers take 6/7 days to do 1 job
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1/5 as many bricklayers will take 5 times as long, so
7 bricklayers take 30/7 days to do 1 job
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4 jobs will take 4 times as long, so
7 bricklayers take 120/7 days to do 4 jobs
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{{{ 120/7 = 17 + 1/7 }}}, so
7 bricklayers take 17 and 1/7 days to do 4 jobs
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Hope I got it


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