Roshel had 8 more cookies than Fiona at first. After Roshel ate 4 cookies, she had thrice as many cookies as Fiona in the end. How many cookies did Fiona have?
| |
Fiona |
Roshel |
| Before |
1 u |
1 u + 8 |
| Change |
|
- 4 |
| After |
1 u |
1 u + 4 |
Comparing Fiona
and Roshel in the end |
1 u |
3 u |
The number of cookies that Fiona had remains unchanged.
Number of cookies that Roshel had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 4
3 u - 1 u = 4
2 u = 4
1 u = 4 ÷ 2 = 2
Number of cookies that Fiona had
= 1 u
= 2
Answer(s): 2
