Rael has a total of 22 of yellow and blue staplers.
13 of the yellow staplers and half of the blue staplers are new. How many of his blue staplers are new if he has a total of 10 new staplers?
| |
Yellow staplers |
Blue staplers |
Total |
| Total |
3 u |
2 p |
22 |
| New |
1 u |
1 p |
10 |
| Old |
2 u |
1 p |
12 |
Number of old staplers
= 22 - 10
= 12
1 u + 1 p = 10 --- (1)
2 u + 1 p = 12 --- (2)
(2) - (1)
(2 u + 1 p) - (1 u + 1 p) = 12 - 10
2 u - 1 u = 2
1 u = 2
1 u = 2 ÷ 1 = 2
Number of new blue staplers
= 10 - 1 u
= 10 - 2
= 8
Answer(s): 8
