Mr. Lu employed some plumbers and painters for his construction site. A painter was paid $7 a day and a plumber was paid $20 a day. Given that he employed 3 times as many plumbers as painters and a total of $268 was paid to these workers for the day, how many more plumbers than painters did Mr. Lu employ for his site?
| |
Plumbers |
Painters |
Difference |
Total |
| Number |
3 u |
1 u |
2 u |
|
| Value |
20 |
7 |
|
|
| Total value |
60 u |
7 u |
|
67 u |
Number of painters = 1 u
Number of plumbers = 3 x 1 u = 3 u
Total amount paid
= (3 u x 20) + (1 u x 7)
= 60 u + 7 u
= 67 u
67 u = 268
1 u = 268 ÷ 67 = 4
Number of more plumbers than painters
= 3 u - 1 u
= 2 u
= 2 x 4
= 8
Answer(s): 8
