Tiffany had 200 stamps. Luis had 12 of what Tiffany had. After Tiffany used some of his stamps and Luis used 15 of his stamps, Tiffany had 14 as many stamps left as Luis.
- How many stamps did Luis have at first?
- How many stamps did Tiffany use?
| |
Tiffany |
Luis |
| Before |
200 |
100 |
| Change |
- ? |
- 20 |
| After |
20 |
80 |
(a)
Number of stamps that Luis had at first
=
12 x 200
= 100
(b)
Number of stamps that Luis used
=
15 x 100
= 20
Number of stamps that Luis had left
= 100 - 20
= 80
Number of stamps that Tiffany had left
=
14 x 80
= 20
Number of stamps that Tiffany used
= 200 - 20
= 180
Answer(s): (a) 100; (b) 180
