Tiffany had 15 more cupcakes than Opal at first. After Tiffany ate 3 cupcakes, she had five times as many cupcakes as Opal in the end. How many cupcakes did Opal have?
| |
Opal |
Tiffany |
| Before |
1 u |
1 u + 15 |
| Change |
|
- 3 |
| After |
1 u |
1 u + 12 |
Comparing Opal
and Tiffany in the end |
1 u |
5 u |
The number of cupcakes that Opal had remains unchanged.
Number of cupcakes that Tiffany had in the end
= 5 x 1 u
= 5 u
5 u = 1 u + 12
5 u - 1 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Number of cupcakes that Opal had
= 1 u
= 3
Answer(s): 3
