it takes Brenda 7 hours to oil the lanes in a bowling alley. gabriella can oil the same lanes in 6 hours. how long would it take them if they worked together?
Stacey Warren - Expert brainly.com
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these problems are always easiest when you can figure out how much work is done by each person in "1" hour...
If B takes 7 hours to complete it by herself; then in 1 hour she does 1/7 of the work
if G takes 6 hours to complete it by herself; then in 1 hour she does 1/6 of the work.
Working together; they should do:
1/6 + 1/7 of the work in 1 hour.
13/42 get done in one hour if they work together.
13/42 times how many hours equals 42/42?
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The actual formula is (x/the amount of time for one person) + (x/the amount of time for the second person) = 1
so we would have
x/7 + x/6 = 1
Common denominator of 42 should be multiplied by each term
42(x/7) + 42(x/6) = 42(1) cancelling you would get
6x + 7x = 42
13x = 42 divide by 13
x = 4
It would take them 4 hours working together.
1 hour = 13/42
2 hours = 26/42
3 hours = 39/42
3 hours and something so far :)
o okay thank u
4(13) = 52, not 42....
3 hours and 1/14th of another.... which is less than 5 minutes