Re: (1/(x+6))+(1/x)=(1/7)

Think of the amount done in 1 hour Together they do 1/7th of the work. The fraction A alone would in 1 hour is 1/x and for B it would be 1/(x+6)

Hence together in 1 hour the fraction they would do would be 1/x+1/(x+6) which therefore =1/7

Re: (1/(x+6))+(1/x)=(1/7)

Thank you, but do you happen to know the answer to the 2nd part of my question?

Re: (1/(x+6))+(1/x)=(1/7)

For the 2nd part I can't see anything wrong with your working. Only the positive answer applies of course.

Re: (1/(x+6))+(1/x)=(1/7)

Quote:

Originally Posted by

**biffboy** For the 2nd part I can't see anything wrong with your working. Only the positive answer applies of course.

Yep both +ve and -ve are correct ans for x - its just negative time doesn't make much sense to us.