SOLUTION: A can do a certain job in 4 days and with B assistance he can do a job in 12/7 days. how long will b take to finish the job working alone

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: A can do a certain job in 4 days and with B assistance he can do a job in 12/7 days. how long will b take to finish the job working alone      Log On


   

Question 1088403: A can do a certain job in 4 days and with B assistance he can do a job in 12/7 days. how long will b take to finish the job working alone
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate x Time= Output
.
.
.
R%5BA%5D%2A4=100
R%5BA%5D=25
.
.
.
%28R%5BA%5D%2BR%5BB%5D%29%2A%2812%2F7%29=100
12%2825%2BR%5BB%5D%29=700
300%2B12R%5BB%5D=700
12R%5BB%5D=400
R%5BB%5D=400%2F12
R%5BB%5D=100%2F3
So,
R%5BB%5D%2At%5BB%5D=100
%28100%2F3%29%2At%5BB%5D=100
t%5BB%5D=3days