Pamela and Lynn collected erasers. Pamela gave 30% of her erasers to Lynn. As a result, Lynn's erasers increased by 80%. If Pamela had 224 erasers left, find the total number of erasers the two girls had at first.
| |
Pamela |
Lynn |
Comparing the change
in Lynn's erasers |
| Before |
10x4 =
40 u |
|
5x3 =
15 u |
| Change |
- 3x4 =
- 12 u |
+ 3x4 =
+ 12 u |
+ 4x3 =
+ 12 u |
| After |
7x4 =
28 u |
|
9x3 =
27 u |
30% =
30100 =
310 80% =
80100 =
45 The number of erasers that Pamela gave to Lynn is repeated. Make the number of erasers that Pamela gave to Lynn the same. LCM of 3 and 4 is 12.
Number of erasers that Pamela had in the end = 28 u
28 u = 224
1 u = 224 ÷ 28 = 8
Number of erasers that Pamela and Lynn had at first
= 40 u + 15 u
= 55 u
= 55 x 8
= 440
Answer(s): 440
