Jenson has a total of 45 of grey and green staplers.
13 of the grey staplers and half of the green staplers are new. How many of his green staplers are new if he has a total of 17 new staplers?
| |
Grey staplers |
Green staplers |
Total |
| Total |
3 u |
2 p |
45 |
| New |
1 u |
1 p |
17 |
| Old |
2 u |
1 p |
28 |
Number of old staplers
= 45 - 17
= 28
1 u + 1 p = 17 --- (1)
2 u + 1 p = 28 --- (2)
(2) - (1)
(2 u + 1 p) - (1 u + 1 p) = 28 - 17
2 u - 1 u = 11
1 u = 11
1 u = 11 ÷ 1 = 11
Number of new green staplers
= 17 - 1 u
= 17 - 11
= 6
Answer(s): 6
