Ken had 4 times as many yellow staplers as white staplers. After giving away 6 yellow staplers and buying another 6 white staplers, he had an equal number of yellow and white staplers. How many yellow staplers did Ken have at first?
| |
Yellow staplers |
White staplers |
| Before |
4 u |
1 u |
| Change |
- 6 |
+ 6 |
| After |
4 u - 6 |
1 u + 6 |
The number of yellow and white staplers is the same in the end.
4 u - 6 = 1 u + 6
4 u - 1 u = 6 + 6
3 u = 6 + 6
3 u = 12
1 u = 12 ÷ 3 = 4
Number of yellow staplers that Ken had at first
= 4 u
= 4 x 4
= 16
Answer(s): 16
