Shiyun bought thrice as many cookies as Julian. After Shiyun ate 3 cookies, she had 11 more cookies than Julian. How many cookies did they buy altogether?
| |
Shiyun |
Julian |
Total |
| Before |
3 u |
1 u |
4 u |
| Change |
- 3 |
|
|
| After |
3 u - 3 |
1 u |
|
The number of cookies that Julian had remains unchanged.
If Julian had another 11 cookies in the end, the number of cookies that Shiyun and Julian had would be the same.
3 u - 3 = 1 u + 11
3 u - 1 u = 11 + 3
2 u = 14
1 u = 14 ÷ 2 = 7
Total number of cookies
= 3 u + 1 u
= 4 u
= 4 x 7
= 28
Answer(s): 28
