SOLUTION: What is the proportion of the 6 builders to build a wall in 15 day and 10 builders to build same

Algebra ->  Rate-of-work-word-problems -> SOLUTION: What is the proportion of the 6 builders to build a wall in 15 day and 10 builders to build same       Log On


   

Question 1071135: What is the proportion of the 6 builders to build a wall in 15 day and 10 builders to build same
Answer by ikleyn(52812) About Me  (Show Source):
You can put this solution on YOUR website!
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The equation for man-days is


6*15 = 10*x.   (1)


If you want to write it as a proportion, here it is:


6%2Fx = 10%2F15.


Inverse proportionality.


If you want, you can present (1) equivalently as the equality for the rates:


1%2F%286%2A15%29 = 1%2F%2810%2Ax%29.     (2).


Both sides of (2) are rates (that are assumed to be the same).


To see solved problems on this subject, look into the lesson
    - Rate of work problems
in this site.


Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic "Rate of work and joint work problems" of the section "Word problems".