Answers

2014-10-08T17:05:05+08:00
Three and one-half lowest term is one and one-half

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2014-10-08T21:59:42+08:00
Nial can complete 1/4 part of the job in 1 day
Nial & Celine can complete  1/(7/3) = 3/7 part of a job in 1 day
thus Celine can complete    3/7 - 1/4 = (12-7)/28  = 5/28 part of a job in 1 day
# of days Celine will take to do the whole job =    28/5 = 5 3/5 days
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