If it takes 9 people to collect 10 kg of wood in 12 hours. How long does it take 7 people to collect 7.5 kg of same wood?
Last edited by joshuaa; Mar 12th 2012 at 12:47 PM.
Follow Math Help Forum on Facebook and Google+
Originally Posted by joshuaa If it takes 9 people to collect 10 kg of wood in 12 hours. How long does it take 7 people to collect 7.5 kg of same wood? one person collects (10/9) kg wood in 12 hrs ...
so in the second side one person collects 7.5/7 in unknown hours. I still need to know the time???
(number of people)(wood collection rate for 1 person)(time) = total wood collected
If we plug the values of the left side (9)(10/9)(12) = 10 120 = 10 is the final answer which is not correct If we plug the values of the right side (7)(7.5/7)(X) = 7.5 X = 1 is the final answer which I think is not correct too Explain More...
Originally Posted by skeeter (number of people)(wood collection rate for 1 person)(time) = total wood collected one more time ... now do it for 7 people and and 7.5 kg and solve for t
(7)[(7.5/7)kg/t](t) = 7.5 i end up with 7.5=7.5 because t and t was cancelled
solve for t
Thanks a lot. It was so helpful
Why the rate was not [(7.5/7)/X]?
View Tag Cloud