Hazel had 16 more cookies than Xuan at first. After Hazel ate 4 cookies, she had thrice as many cookies as Xuan in the end. How many cookies did Xuan have?
| |
Xuan |
Hazel |
| Before |
1 u |
1 u + 16 |
| Change |
|
- 4 |
| After |
1 u |
1 u + 12 |
Comparing Xuan
and Hazel in the end |
1 u |
3 u |
The number of cookies that Xuan had remains unchanged.
Number of cookies that Hazel had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 12
3 u - 1 u = 12
2 u = 12
1 u = 12 ÷ 2 = 6
Number of cookies that Xuan had
= 1 u
= 6
Answer(s): 6
