SOLUTION: Lola and Berry work a a factory that makes rubber duckies. If it takes Lola 8 seconds to paint a duck's bill red and Betty 10 seconds to do the same, how many seconds will it take

Question 1146589: Lola and Berry work a a factory that makes rubber duckies. If it takes Lola 8 seconds to paint a duck's bill red and Betty 10 seconds to do the same, how many seconds will it take them together to pain 36 red bills?
Found 2 solutions by Boreal, josgarithmetic:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
in one second, L does 1/8 and Betty 1/10
in x seconds it is x/8 and x/10
This has to equal 36
(x/8)+(x/10)=36
multiply by 40
5x+4x=1440
9x=1440
x=160 seconds
20 for L and 16 for B.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
One job : Paint a bill red

---------------Lola and Barry together doing the jobs

Thirty-six bills

2 minutes 40 seconds
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