Natalie had 36 more pens than Tiffany. After Tiffany gave away
18 of her pens, Natalie had twice as many pens as Tiffany. How many pens did Tiffany have at first?
| |
Natalie |
Tiffany |
Comparing Natalie and
Tiffany at first |
36 more |
|
| Before |
14 u |
8 u |
| Change |
|
- 1 u |
| After |
14 u |
7 u |
Comparing Natalie and
Tiffany in the end |
2x7 =
14 u |
1x7 =
7 u |
Number of pens that Tiffany had in the end is repeated. Make the number of pens that Tiffany had in the end the same. LCM of 1 and 7 is 7.
Number of pens that Natalie had at first = 14 u
Number of pens that Natalie had more than Tiffany at first
= 14 u - 8 u
= 6 u
6 u = 36
1 u = 36 ÷ 6 = 6
Number of pens that Tiffany had at first
= 8 u
= 8 x 6
= 48
Answer(s): 48
