Yen had 8 more pens than Barbara. After Barbara gave away
38 of her pens, Yen had twice as many pens as Barbara. How many pens did Barbara have at first?
| |
Yen |
Barbara |
Comparing Yen and
Barbara at first |
8 more |
|
| Before |
10 u |
8 u |
| Change |
|
- 3 u |
| After |
10 u |
5 u |
Comparing Yen and
Barbara in the end |
2x5 =
10 u |
1x5 =
5 u |
Number of pens that Barbara had in the end is repeated. Make the number of pens that Barbara had in the end the same. LCM of 1 and 5 is 5.
Number of pens that Yen had at first = 10 u
Number of pens that Yen had more than Barbara at first
= 10 u - 8 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Number of pens that Barbara had at first
= 8 u
= 8 x 4
= 32
Answer(s): 32
