Julie had 99 more pens than Tammy. After Tammy gave away
15 of her pens, Julie had four times as many pens as Tammy. How many pens did Tammy have at first?
| |
Julie |
Tammy |
Comparing Julie
and Tammy at first |
99 more |
|
| Before |
16 u |
5 u |
| Change |
|
- 1 u |
| After |
|
4 u |
Comparing Julie
and Tammy in the end |
4x4 =
16 u |
1x4 =
4 u |
The number of pens that Julie had at first and in the end remains unchanged. Make the number of pens that Julie had the same. LCM of 16 and 4 is 16.
Number of pens that Julie had more than Tammy at first
= 16 u - 5 u
= 11 u
11 u = 99
1 u = 99 ÷ 11 = 9
Number of pens that Tammy had at first
= 5 u
= 5 x 9
= 45
Answer(s): 45
