Zara had 9 more cookies than Xuan at first. After Zara ate 5 cookies, she had five times as many cookies as Xuan in the end. How many cookies did Xuan have?
| |
Xuan |
Zara |
| Before |
1 u |
1 u + 9 |
| Change |
|
- 5 |
| After |
1 u |
1 u + 4 |
Comparing Xuan
and Zara in the end |
1 u |
5 u |
The number of cookies that Xuan had remains unchanged.
Number of cookies that Zara had in the end
= 5 x 1 u
= 5 u
5 u = 1 u + 4
5 u - 1 u = 4
4 u = 4
1 u = 4 ÷ 4 = 1
Number of cookies that Xuan had
= 1 u
= 1
Answer(s): 1
