- Letx¼the time it will take Walter to complete the project.
45
75
þ
45
x
¼1 LCD¼ 75 x
751 x
45
751
þ 75 x
45
x
¼ 75 x 1
45 xþ 3375 ¼ 75 x
45 x 45 xþ 3375 ¼ 75 x 45 x
3375 ¼ 30 x
3375
30
¼
301 x
301
112 :5 minutes¼x
- Letx¼the time it takes to fill the tank if all three pipes are open.
1
60
xþ
1
80
xþ
1
90
x¼1 LCD¼ 720
72012
1
x
601
þ
7209
1
x
801
þ
7208
1
x
901
¼ 720 1
12 xþ 9 xþ 8 x¼ 720
29 x¼ 720
291 x
291
¼
720
29
x¼ 24 :83 minutes
192 LESSON 17 Solving Work Problems