Lisa, Sue, Maria can do a job in 12 hours. If each person worked alone it would take Lisa 30hrs and Maria would take twice as long as Sue. How long would it take Maria alone?

Question

help!!!! · Answer

@mathmale

help!!!! · Answer

My thought process Lisa=30 Maria=2x Sue=x. |dw:1449630709674:dw| @jim_thompson5910

jim_thompson5910 · Answer

you have the correct equation set up

jim_thompson5910 · Answer

what I would do next is multiply both sides by the LCD, which in this case is 30x

jim_thompson5910 · Answer

doing that will clear out the fractions

help!!!! · Answer

Thanks! For some reason I had the LCD as 60 and I probably made a mathematical error.

jim_thompson5910 · Answer

well you could use 60, but you'd have to throw x in there too

jim_thompson5910 · Answer

but 30x is the lowest you can go in terms of the common multiple between 30, 2x and x