Marion had 8 more erasers than Nora. After Nora gave away
16 of her erasers, Marion had twice as many erasers as Nora. How many erasers did Nora have at first?
| |
Marion |
Nora |
Comparing Marion and
Nora at first |
8 more |
|
| Before |
10 u |
6 u |
| Change |
|
- 1 u |
| After |
10 u |
5 u |
Comparing Marion and
Nora in the end |
2x5 =
10 u |
1x5 =
5 u |
Number of erasers that Nora had in the end is repeated. Make the number of erasers that Nora had in the end the same. LCM of 1 and 5 is 5.
Number of erasers that Marion had at first = 10 u
Number of erasers that Marion had more than Nora at first
= 10 u - 6 u
= 4 u
4 u = 8
1 u = 8 ÷ 4 = 2
Number of erasers that Nora had at first
= 6 u
= 6 x 2
= 12
Answer(s): 12
