Sandi can make a quilt in 9 days and eva can make a quilt in 6 days. In how many days can they make a quilt working together?

Question

wolf1728 · Answer

There is a formula for this:
(S x E) / (s+e)
9 x 6 / 9 +6 =
54 / 15
Equals 3.6 days

anonymous · Answer

thank you so much!!! i appreciate your help!

wolf1728 · Answer

and thank you

anonymous · Answer

1 / (1/6 + 1/9) = 3.6 days

wolf1728 · Answer

Okay to see it worked out
Sandy can make 1/9 of a quilt in one day
Eva can make 1/6 of a quilt in one day.
Both working together they make (1/6 + 1/9) part of a quilt in one day.
(1/6 + 1/9) = (3/18 + 2/18) = 5/18 of a quilt per day.
So, a whole quilt takes 1/(5/18) days which equals (18/5) which equals 3 + 3/5 days
(or 3 + 6/10 days)

wolf1728 · Answer

Gee - 3 medals for one question.  Thanks folks.