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

Algebra ->  Equations -> 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       Log On


   

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) About Me  (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) About Me  (Show Source):
You can put this solution on YOUR website!
One job : Paint a bill red

1%2F8%2B1%2F10job%2Fseconds%29
5%2F40%2B4%2F40
9%2F40---------------Lola and Barry together doing the jobs


Thirty-six bills
%289%2F40%29x=36
x%2F40=4
highlight%28x=160%29seconds
2 minutes 40 seconds