Mr. Ng employed some plumbers and painters for his construction site. A painter was paid $8 a day and a plumber was paid $16 a day. Given that he employed 3 times as many plumbers as painters and a total of $280 was paid to these workers for the day, how many more plumbers than painters did Mr. Ng employ for his site?
| |
Plumbers |
Painters |
Difference |
Total |
| Number |
3 u |
1 u |
2 u |
|
| Value |
16 |
8 |
|
|
| Total value |
48 u |
8 u |
|
56 u |
Number of painters = 1 u
Number of plumbers = 3 x 1 u = 3 u
Total amount paid
= (3 u x 16) + (1 u x 8)
= 48 u + 8 u
= 56 u
56 u = 280
1 u = 280 ÷ 56 = 5
Number of more plumbers than painters
= 3 u - 1 u
= 2 u
= 2 x 5
= 10
Answer(s): 10
