Question

Tommy can paint a fence in 12 hours. If his friends help they can paint the fence in

Answer 1

1 hour.

Answer 2

How long would it take for huck to paint he fence by himself

Answer 3

guessing 12 hours

Answer 4

i don't think so

Answer 5

16.4 hours

Answer 6

Let z be the time that his friend can paint the fence by himself than
in one ha to solve the equation
\[
\frac{1}{z}+\frac{1}{12}=\frac 11
\]
why?

Answer 7

\[
12 + z =12 z\\
11 z =12\\
z= \frac {11}{12}
\]

Answer 8

Practice problems related to your on
http://www.saab.org/mathdrills/workcompletion.cgi