Lynn had 4 times as many erasers as Tiffany at first. After Lynn gave 45 erasers to Tiffany, they each had the same number of erasers in the end. How many erasers did Lynn have at first?
| |
Lynn |
Tiffany |
| Before |
4 u |
1 u |
| Change |
- 45 |
+ 45 |
| After |
4 u - 45 |
1 u + 45 |
Comparing Lynn and
Tiffany in the end |
1 |
1 |
The number of erasers that Lynn and Tiffany had in the end is equal.
4 u - 45 = 1 u + 45
4 u - 1 u = 45 + 45
3 u = 90
1 u = 30
Number of erasers that Lynn had at first
= 4 u
= 4 x 30
= 120
Answer(s): 120
