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ivettef365
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If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them to paint the house together?
 one year ago
 one year ago
ivettef365 Group Title
If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them to paint the house together?
 one year ago
 one year ago

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satellite73 Group TitleBest ResponseYou've already chosen the best response.2
\[\frac{6\times 4}{6+4}\] is a start
 one year ago

phanta_seea Group TitleBest ResponseYou've already chosen the best response.0
how did you get the formula satellite?
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
if you do two of these you will see it
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
one has a rate of \(\frac{1}{6}\) the other a rate of \(\frac{1}{4}\) the combined rate is the sum \(\frac{1}{6}+\frac{1}{4}=\frac{4+6}{6\times 4}\) you want to solve rate times time equals one job, i.e. \[\frac{4+6}{6\times 4}t=1\] so \[t=\frac{6\times 4}{4+6}\]
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
you can work it out step by step for each problem and get the same answer, but if you have to do more than one of these, say adam eats an apple if m minutes, eve eats an apple in n minutes, together they can eat the apple in \[\frac{m\times n}{m+n}\] minutes saves time , especially on a test or quiz
 one year ago
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