Elijah has a total of 58 of blue and grey staplers.
14 of the blue staplers and half of the grey staplers are new. How many of his grey staplers are new if he has a total of 17 new staplers?
| |
Blue staplers |
Grey staplers |
Total |
| Total |
4 u |
2 p |
58 |
| New |
1 u |
1 p |
17 |
| Old |
3 u |
1 p |
41 |
Number of old staplers
= 58 - 17
= 41
1 u + 1 p = 17 --- (1)
3 u + 1 p = 41 --- (2)
(2) - (1)
(3 u + 1 p) - (1 u + 1 p) = 41 - 17
3 u - 1 u = 24
2 u = 24
1 u = 24 ÷ 2 = 12
Number of new grey staplers
= 17 - 1 u
= 17 - 12
= 5
Answer(s): 5
