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Phil can paint the garage in 10 hours. If Rick helps Phil they can complete in 6 hours. How long for Rick? ?
This is an algebra question. Immediate help would be greatly appreciated.
in 6 hours, Pill will paint 60% of the garage (6hrs * 10% per hour)
so in the same 6 hours, Rick will paint 40% of the garage.
so, it will take Rick (6 hours) * (100%/40%) = 15 hours
in other words, Rick works at a rate of 40% per 6 hours or 6.67% per hour.
100% divided by (6.67 %/hr) = 15hr
or
15hr * 6.67 %/hr = 100%
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