A single job takes 20 hours, while B is 4 hours more than A, and C is 2 hours more than half of A. If Party A and Party B work together first 10 hour, how many hours can Party C work alone?
Solution:
It takes 24 hours for B to work alone, and it takes 12 hours for C to work alone.
That is, 1/20 for A and 1/24 for B..
C do it every hour112.
Set it up now, and it can be completed in x hours.
A completed 1/20.
×
10= 1/2
B completed 1/24.
×
10=5/ 12
C complete112.
×
X
These three people added up to finish the whole work.
Column equation
1/2
+5/ 12
+
1/ 12
X
= 1
solve an equation
X= 1
So C worked alone for 1 hour.