We will solve "working together word problems" with proportion. It may easier to tackle than algebra.
1
5

+
1
20

1
5

+
1
20

1
5

+
1
20

=
4
20

+
1
20

=
5
20

5
20

×
20
5
× x

=
100
100
= 1x = x

1
5

+
1
20

=
4
20

+
1
20

=
5
20

5
20

×
20
5

=
100
100
= 1

1
20

=
20
20
x

1
20

=
20
20
x

1
20


1
25

1
20


1
25

5
100


4
100

or
1
100

5
100


4
100

or
1
100

This means that it will take the friend 100 days to finish the house garage by himself.
Want more working together word problems?
May 26, 22 06:50 AM
Learn how to find the area of a rhombus when the lengths of the diagonals are missing.