The ratio of Andrew's erasers to Amelia's erasers at first was 3 : 5. After Andrew gave Amelia 12 erasers, the ratio of Andrew's erasers to Amelia's erasers is 1 : 3. What was the number of erasers they had altogether?
| |
Andrew |
Amelia |
Total |
| Before |
3x4 =
12 u |
5x4 =
20 u
|
8x4 =
32 u |
| Change |
- 12 |
+ 12 |
|
| After |
1x8 =
8 u |
3x8 =
24 u |
4x8 =
32 u |
Number of erasers that Andrew gave Amelia
= 12 u - 8 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Total number of erasers that they had
= 32 u
= 32 x 3
= 96
Answer(s): 96
