Zane has a total of 62 of white and yellow staplers.
14 of the white staplers and half of the yellow staplers are new. How many of his yellow staplers are new if he has a total of 19 new staplers?
| |
White staplers |
Yellow staplers |
Total |
| Total |
4 u |
2 p |
62 |
| New |
1 u |
1 p |
19 |
| Old |
3 u |
1 p |
43 |
Number of old staplers
= 62 - 19
= 43
1 u + 1 p = 19 --- (1)
3 u + 1 p = 43 --- (2)
(2) - (1)
(3 u + 1 p) - (1 u + 1 p) = 43 - 19
3 u - 1 u = 24
2 u = 24
1 u = 24 ÷ 2 = 12
Number of new yellow staplers
= 19 - 1 u
= 19 - 12
= 7
Answer(s): 7
