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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?
 7 months ago
 7 months ago
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?
 7 months ago
 7 months ago

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satellite73Best ResponseYou've already chosen the best response.2
\[\frac{6\times 4}{6+4}\] is a start
 7 months ago

phanta_seeaBest ResponseYou've already chosen the best response.0
how did you get the formula satellite?
 7 months ago

satellite73Best ResponseYou've already chosen the best response.2
if you do two of these you will see it
 7 months ago

satellite73Best 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 \[t=\frac{6\times 4}{4+6}\]
 7 months ago

satellite73Best 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
 7 months ago
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