Albert has a total of 40 of pink and grey staplers.
16 of the pink staplers and half of the grey staplers are new. How many of his grey staplers are new if he has a total of 14 new staplers?
|
Pink staplers |
Grey staplers |
Total |
Total |
6 u |
2 p |
40 |
New |
1 u |
1 p |
14 |
Old |
5 u |
1 p |
26 |
Number of old staplers
= 40 - 14
= 26
1 u + 1 p = 14 --- (1)
5 u + 1 p = 26 --- (2)
(2) - (1)
(5 u + 1 p) - (1 u + 1 p) = 26 - 14
5 u - 1 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Number of new grey staplers
= 14 - 1 u
= 14 - 3
= 11
Answer(s): 11