Ian has a total of 38 of yellow and pink staplers.
16 of the yellow staplers and half of the pink staplers are new. How many of his pink staplers are new if he has a total of 13 new staplers?
| |
Yellow staplers |
Pink staplers |
Total |
| Total |
6 u |
2 p |
38 |
| New |
1 u |
1 p |
13 |
| Old |
5 u |
1 p |
25 |
Number of old staplers
= 38 - 13
= 25
1 u + 1 p = 13 --- (1)
5 u + 1 p = 25 --- (2)
(2) - (1)
(5 u + 1 p) - (1 u + 1 p) = 25 - 13
5 u - 1 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Number of new pink staplers
= 13 - 1 u
= 13 - 3
= 10
Answer(s): 10
