A company contracts to paint 3 houses. Mr.Brown can paint a house in 6 days while Mr.Black would take 8 days and Mr.Blue 12 days. After 8 days Mr.Brown goes on vacation and Mr. Black begins to work for a period of 6 days. How many days will it take Mr.Blue to complete the contract? Choose the correct choice: A) 7 B) 8 C) 10 D) 11 E) 12
let x is amount of work to be done to paint one house.   So Brown's one day work is x/6, black's can do x/8 work in   one day and blue is x/12.   Total houses is 3, so tatal work to be done is 3x.   3x= 8*(x/6) + 6*(x/8) + y*(x/12)   finally y = 11.   blue will complete the remaining work in 11 days.   ANSWER:11
<result>D</result>
A company contracts to paint 3 houses. Mr.Brown can paint a house in 6 days while Mr.Black would take 8 days and Mr.Blue 12 days. After 8 days Mr.Brown goes on vacation and Mr. Black begins to work for a period of 6 days. How many days will it take Mr.Blue to complete the contract?